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|Agriculture and Agronomy portal|
Agriculture is the cultivation of animals, plants, fungi, and other life forms for food, fiber, biofuel, medicinal and other products used to sustain and enhance human life. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the development of civilization. The study of agriculture is known as agricultural science. The history of agriculture dates back thousands of years, and its development has been driven and defined by greatly different climates, cultures, and technologies. In the civilized world, industrial agriculture based on large-scale monoculture farming has become the dominant agricultural methodology.
Modern agronomy, plant breeding, agrochemicals such as pesticides and fertilizers, and technological developments have in many cases sharply increased yields from cultivation, but at the same time have caused widespread ecological damage and negative human health effects. Selective breeding and modern practices in animal husbandry have similarly increased the output of meat, but have raised concerns about animal welfare and the health effects of the antibiotics, growth hormones, and other chemicals commonly used in industrial meat production. Genetically modified organisms are an increasing component of agriculture, although they are banned in several countries. Agricultural food production and water management are increasingly becoming global issues that are fostering debate on a number of fronts. Significant degradation of land and water resources, including the depletion of aquifers, has been observed in recent decades, and the effects of global warming on agriculture and of agriculture on global warming are still not fully understood.
The major agricultural products can be broadly grouped into foods, fibers, fuels, and raw materials. Specific foods include cereals (grains), vegetables, fruits, oils, meats and spices. Fibers include cotton, wool, hemp, silk and flax. Raw materials include lumber and bamboo. Other useful materials are produced by plants, such as resins, dyes, drugs, perfumes, biofuels and ornamental products such as cut flowers and nursery plants. Over one third of the world's workers are employed in agriculture, second only to the services' sector, although the percentages of agricultural workers in developed countries has decreased significantly over the past several centuries.
- 1 Etymology and terminology
- 2 History
- 3 Agriculture and civilization
- 4 Contemporary agriculture
- 5 Workforce
- 6 Agricultural production systems
- 7 Production practices
- 8 Crop alteration and biotechnology
- 9 Environmental impact
- 10 Agricultural economics
- 11 Agricultural science
- 12 List of countries by agricultural output
- 13 Energy and agriculture
- 14 Policy
- 15 See also
- 16 References
- 17 Further reading
- 18 External links
Etymology and terminology
The word agriculture is a late Middle English adaptation of Latin agricultūra, from ager, "field", and cultūra, "cultivation" or "growing". Agriculture usually refers to human activities, although it is also observed in certain species of ant, termite and ambrosia beetle. To practice agriculture means to use natural resources to "produce commodities which maintain life, including food, fiber, forest products, horticultural crops, and their related services." This definition includes arable farming or agronomy, and horticulture, all terms for the growing of plants, animal husbandry and forestry. A distinction is sometimes made between forestry and agriculture, based on the former's longer management rotations, extensive versus intensive management practices and development mainly by nature, rather than by man. Even then, it is acknowledged that there is a large amount of knowledge transfer and overlap between silviculture (the management of forests) and agriculture. In traditional farming, the two are often combined even on small landholdings, leading to the term agroforestry.
Agriculture involving domestication of plants was developed around 11,500 years ago separately in both the Fertile crescent and at Chogha Golan in modern day Iran, where wild barley, wheat and lentils were cultivated and with domesticated forms of wheat appeared about 9,800 years ago. Agriculture has undergone significant developments since the time of the earliest cultivation. The Fertile Crescent of Western Asia, Egypt and India were sites of the earliest planned sowing and harvesting of plants that had previously been gathered in the wild. Independent development of agriculture occurred in northern and southern China, Africa's Sahel, New Guinea, parts of India and several regions of the Americas. Agricultural techniques such as irrigation, crop rotation, the application of fertilizers were developed soon after the Neolithic Revolution but have made significant strides in the past 200 years. The Haber-Bosch method for synthesizing ammonium nitrate represented a major breakthrough and allowed crop yields to overcome previous constraints.
In the past century, agriculture in the developed nations, and to a lesser extent in the developing world, has been characterized by enhanced productivity, the replacement of human labor by synthetic fertilizers and pesticides, selective breeding, and mechanization. The recent history of agriculture has been closely tied with a range of political issues including water pollution, biofuels, genetically modified organisms, tariffs and farm subsidies.
Agriculture and civilization
Civilization was the product of the Agricultural Neolithic Revolution. In the course of history, civilization coincided in space with fertile areas (The Fertile Crescent) and most intensive state formation took place in circumscribed agricultural lands (Carneiro's circumscription theory). The Great Wall of China and the Roman limes demarcated the same northern frontier of the basic (cereal) agriculture. This cereal belt nourished the belt of great civilizations formed in the Axial Age and connected by the famous Silk Road.
Ancient Egyptians, whose agriculture depended exclusively on Nile, deified the River, worshiped, and exalted in a great hymn. The Chinese imperial court issued numerous edicts, stating: "Agriculture is the foundation of this Empire."  Egyptian, Mesopotamian, Chinese, and Inca Emperors themselves plowed ceremonial fields in order to show personal example to everyone. "Thus the most exalted men in human history—the Beloved of the Gods, the Son of Sun, the Son of Heaven, and Inca—although ceremonially but nonetheless personally tilled the earth."
Ancient strategists, Chinese Guan Zhong and Shang Yang and Indian Kautilya, drew doctrines linking agriculture with military power. Agriculture defined the limits on how large and for how long an army could be mobilized. Shang Yang called agriculture and war the One. In the vast human pantheon of agricultural deities List of agricultural deities there are several deities who combined the functions of agriculture and war. Great granaries were the inevitable feature of great empires.
As the Neolithic Agricultural Revolution produced civilization, the modern Agricultural Revolution, begun in Britain British Agricultural Revolution, made possible the Industrial civilization. The first precondition for industry was greater yields by less manpower, resulting in greater percentage of manpower available for non-agricultural sectors. The most industrial world appeared in the most fertile cereal regions of the world. Today's Industrial North Global North originally was the belt of civilizations formed in the Axial Age.
The link between the basic (cereal) agriculture and military power survived in the Industrial Age too. All modern great powers were first of all great cereal powers, as had been the greatest of their predecessors. The cereal domestic product closely correlates with the Gross Domestic Product and it was argued that the cereal product is the basis of the GDP. The Cold War was waged between two cereal superpowers.The outcome of the Cold War corresponds to the cereal factor too—the United States produced its agricultural miracle, while the USSR suffered a progressive cereal crisis. In 1976, French sociologist Emmanuel Todd, impressed by the magnitude of Soviet grain purchases, predicted the collapse of the USSR within ten years.
In the past century agriculture has been characterized by increased productivity, the substitution of synthetic fertilizers and pesticides for labor, water pollution, and farm subsidies. In recent years there has been a backlash against the external environmental effects of conventional agriculture, resulting in the organic and sustainable agriculture movements. One of the major forces behind this movement has been the European Union, which first certified organic food in 1991 and began reform of its Common Agricultural Policy (CAP) in 2005 to phase out commodity-linked farm subsidies, also known as decoupling. The growth of organic farming has renewed research in alternative technologies such as integrated pest management and selective breeding. Recent mainstream technological developments include genetically modified food.
In 2007, higher incentives for farmers to grow non-food biofuel crops combined with other factors, such as overdevelopment of former farm lands, rising transportation costs, climate change, growing consumer demand in China and India, and population growth, caused food shortages in Asia, the Middle East, Africa, and Mexico, as well as rising food prices around the globe. As of December 2007, 37 countries faced food crises, and 20 had imposed some sort of food-price controls. Some of these shortages resulted in food riots and even deadly stampedes. The International Fund for Agricultural Development posits that an increase in smallholder agriculture may be part of the solution to concerns about food prices and overall food security. They in part base this on the experience of Vietnam, which went from a food importer to large food exporter and saw a significant drop in poverty, due mainly to the development of smallholder agriculture in the country.
Disease and land degradation are two of the major concerns in agriculture today. For example, an epidemic of stem rust on wheat caused by the Ug99 lineage is currently spreading across Africa and into Asia and is causing major concerns due to crop losses of 70% or more under some conditions. Approximately 40% of the world's agricultural land is seriously degraded. In Africa, if current trends of soil degradation continue, the continent might be able to feed just 25% of its population by 2025, according to UNU's Ghana-based Institute for Natural Resources in Africa.
Agrarian structure is a long-term structure in the Braudelian understanding of the concept. On a larger scale the agrarian structure is more dependent on the regional, social, cultural and historical factors than on the state’s undertaken activities. Like in Poland, where despite running an intense agrarian policy for many years, the agrarian structure in 2002 has much in common with that found in 1921 soon after the partitions period.
In 2009, the agricultural output of China was the largest in the world, followed by the European Union, India and the United States, according to the International Monetary Fund (see below). Economists measure the total factor productivity of agriculture and by this measure agriculture in the United States is roughly 1.7 times more productive than it was in 1948.
As of 2011[update], the International Labour Organization states that approximately one billion people, or over 1/3 of the available work force, are employed in the global agricultural sector. Agriculture constitutes approximately 70% of the global employment of children, and in many countries employs the largest percentage of women of any industry. The service sector only overtook the agricultural sector as the largest global employer in 2007. Between 1997 and 2007, the percentage of people employed in agriculture fell by over four percentage points, a trend that is expected to continue. The number of people employed in agriculture varies widely on a per-country basis, ranging from less than 2% in countries like the US and Canada to over 80% in many African nations. In developed countries, these figures are significantly lower than in previous centuries. During the 16th century in Europe, for example, between 55 and 75 percent of the population was engaged in agriculture, depending on the country. By the 19th century in Europe, this had dropped to between 35 and 65 percent. In the same countries today, the figure is less than 10%.
Agriculture, specifically farming, remains a hazardous industry, and farmers worldwide remain at high risk of work-related injuries, lung disease, noise-induced hearing loss, skin diseases, as well as certain cancers related to chemical use and prolonged sun exposure. On industrialized farms, injuries frequently involve the use of agricultural machinery, and a common cause of fatal agricultural injuries in developed countries is tractor rollovers. Pesticides and other chemicals used in farming can also be hazardous to worker health, and workers exposed to pesticides may experience illness or have children with birth defects. As an industry in which families commonly share in work and live on the farm itself, entire families can be at risk for injuries, illness, and death. Common causes of fatal injuries among young farm workers include drowning, machinery and motor vehicle-related accidents.
The International Labour Organization considers agriculture "one of the most hazardous of all economic sectors." It estimates that the annual work-related death toll among agricultural employees is at least 170,000, twice the average rate of other jobs. In addition, incidences of death, injury and illness related to agricultural activities often go unreported. The organization has developed the Safety and Health in Agriculture Convention, 2001, which covers the range of risks in the agriculture occupation, the prevention of these risks and the role that individuals and organizations engaged in agriculture should play.
Agricultural production systems
Crop cultivation systems
Cropping systems vary among farms depending on the available resources and constraints; geography and climate of the farm; government policy; economic, social and political pressures; and the philosophy and culture of the farmer.
Shifting cultivation (or slash and burn) is a system in which forests are burnt, releasing nutrients to support cultivation of annual and then perennial crops for a period of several years. Then the plot is left fallow to regrow forest, and the farmer moves to a new plot, returning after many more years (10–20). This fallow period is shortened if population density grows, requiring the input of nutrients (fertilizer or manure) and some manual pest control. Annual cultivation is the next phase of intensity in which there is no fallow period. This requires even greater nutrient and pest control inputs.
Further industrialization led to the use of monocultures, when one cultivar is planted on a large acreage. Because of the low biodiversity, nutrient use is uniform and pests tend to build up, necessitating the greater use of pesticides and fertilizers. Multiple cropping, in which several crops are grown sequentially in one year, and intercropping, when several crops are grown at the same time, are other kinds of annual cropping systems known as polycultures.
In subtropical and arid environments, the timing and extent of agriculture may be limited by rainfall, either not allowing multiple annual crops in a year, or requiring irrigation. In all of these environments perennial crops are grown (coffee, chocolate) and systems are practiced such as agroforestry. In temperate environments, where ecosystems were predominantly grassland or prairie, highly productive annual farming is the dominant agricultural system.
Important categories of crops include cereals and pseudocereals, pulses (legumes), forage, and fruits and vegetables. Specific crops are cultivated in distinct growing regions throughout the world. In millions of metric tons, based on FAO estimate.
|Top agricultural products, by crop types
(million tonnes) 2004 data
|Vegetables and melons||866|
|Roots and tubers||715|
|Fish (2001 estimate)||130|
Food and Agriculture Organization (FAO)
|Top agricultural products, by individual crops
(million tonnes) 2011 data
Food and Agriculture Organization (FAO)
Livestock production systems
Animals, including horses, mules, oxen, water buffalo, camels, llamas, alpacas, donkeys, and dogs, are often used to help cultivate fields, harvest crops, wrangle other animals, and transport farm products to buyers. Animal husbandry not only refers to the breeding and raising of animals for meat or to harvest animal products (like milk, eggs, or wool) on a continual basis, but also to the breeding and care of species for work and companionship.
Livestock production systems can be defined based on feed source, as grassland-based, mixed, and landless. As of 2010[update], 30% of Earth's ice- and water-free area was used for producing livestock, with the sector employing approximately 1.3 billion people. Between the 1960s and the 2000s, there was a significant increase in livestock production, both by numbers and by carcass weight, especially among beef, pigs and chickens, the latter of which had production increased by almost a factor of 10. Non-meat animals, such as milk cows and egg-producing chickens, also showed significant production increases. Global cattle, sheep and goat populations are expected to continue to increase sharply through 2050. Aquaculture or fish farming, the production of fish for human consumption in confined operations, is one of the fastest growing sectors of food production, growing at an average of 9% a year between 1975 and 2007.
During the second half of the 20th century, producers using selective breeding focused on creating livestock breeds and crossbreeds that increased production, while mostly disregarding the need to preserve genetic diversity. This trend has led to a significant decrease in genetic diversity and resources among livestock breeds, leading to a corresponding decrease in disease resistance and local adaptations previously found among traditional breeds.
Grassland based livestock production relies upon plant material such as shrubland, rangeland, and pastures for feeding ruminant animals. Outside nutrient inputs may be used, however manure is returned directly to the grassland as a major nutrient source. This system is particularly important in areas where crop production is not feasible because of climate or soil, representing 30–40 million pastoralists. Mixed production systems use grassland, fodder crops and grain feed crops as feed for ruminant and monogastric (one stomach; mainly chickens and pigs) livestock. Manure is typically recycled in mixed systems as a fertilizer for crops.
Landless systems rely upon feed from outside the farm, representing the de-linking of crop and livestock production found more prevalently in Organisation for Economic Co-operation and Development(OECD) member countries. Synthetic fertilizers are more heavily relied upon for crop production and manure utilization becomes a challenge as well as a source for pollution. Industrialized countries use these operations to produce much of the global supplies of poultry and pork. Scientists estimate that 75% of the growth in livestock production between 2003 and 2030 will be in confined animal feeding operations, sometimes called factory farming. Much of this growth is happening in developing countries in Asia, with much smaller amounts of growth in Africa. Some of the practices used in commercial livestock production, including the usage of growth hormones, are controversial.
Tillage is the practice of plowing soil to prepare for planting or for nutrient incorporation or for pest control. Tillage varies in intensity from conventional to no-till. It may improve productivity by warming the soil, incorporating fertilizer and controlling weeds, but also renders soil more prone to erosion, triggers the decomposition of organic matter releasing CO2, and reduces the abundance and diversity of soil organisms.
Pest control includes the management of weeds, insects, mites, and diseases. Chemical (pesticides), biological (biocontrol), mechanical (tillage), and cultural practices are used. Cultural practices include crop rotation, culling, cover crops, intercropping, composting, avoidance, and resistance. Integrated pest management attempts to use all of these methods to keep pest populations below the number which would cause economic loss, and recommends pesticides as a last resort.
Nutrient management includes both the source of nutrient inputs for crop and livestock production, and the method of utilization of manure produced by livestock. Nutrient inputs can be chemical inorganic fertilizers, manure, green manure, compost and mined minerals. Crop nutrient use may also be managed using cultural techniques such as crop rotation or a fallow period. Manure is used either by holding livestock where the feed crop is growing, such as in managed intensive rotational grazing, or by spreading either dry or liquid formulations of manure on cropland or pastures.
Water management is needed where rainfall is insufficient or variable, which occurs to some degree in most regions of the world. Some farmers use irrigation to supplement rainfall. In other areas such as the Great Plains in the U.S. and Canada, farmers use a fallow year to conserve soil moisture to use for growing a crop in the following year. Agriculture represents 70% of freshwater use worldwide.
According to a report by the International Food Policy Research Institute, agricultural technologies will have the greatest impact on food production if adopted in combination with each other; using a model that assessed how eleven technologies could impact agricultural productivity, food security and trade by 2050, the International Food Policy Research Institute found that the number of people at risk from hunger could be reduced by as much as 40% and food prices could be reduced by almost half.
"Payment for ecosystem services (PES) can further incentivise efforts to green the agriculture sector. This is an approach that verifies values and rewards the benefits of ecosystem services provided by green agricultural practices." "Innovative PES measures could include reforestation payments made by cities to upstream communities in rural areas of shared watersheds for improved quantities and quality of fresh water for municipal users. Ecoservice payments by farmers to upstream forest stewards for properly managing the flow of soil nutrients, and methods to monetise the carbon sequestration and emission reduction credit benefits of green agriculture practices in order to compensate farmers for their efforts to restore and build SOM and employ other practices." 
Crop alteration and biotechnology
Crop alteration has been practiced by humankind for thousands of years, since the beginning of civilization. Altering crops through breeding practices changes the genetic make-up of a plant to develop crops with more beneficial characteristics for humans, for example, larger fruits or seeds, drought-tolerance, or resistance to pests. Significant advances in plant breeding ensued after the work of geneticist Gregor Mendel. His work on dominant and recessive alleles, although initially largely ignored for almost 50 years, gave plant breeders a better understanding of genetics and breeding techniques. Crop breeding includes techniques such as plant selection with desirable traits, self-pollination and cross-pollination, and molecular techniques that genetically modify the organism.
Domestication of plants has, over the centuries increased yield, improved disease resistance and drought tolerance, eased harvest and improved the taste and nutritional value of crop plants. Careful selection and breeding have had enormous effects on the characteristics of crop plants. Plant selection and breeding in the 1920s and 1930s improved pasture (grasses and clover) in New Zealand. Extensive X-ray and ultraviolet induced mutagenesis efforts (i.e. primitive genetic engineering) during the 1950s produced the modern commercial varieties of grains such as wheat, corn (maize) and barley.
The Green Revolution popularized the use of conventional hybridization to sharply increase yield by creating "high-yielding varieties". For example, average yields of corn (maize) in the USA have increased from around 2.5 tons per hectare (t/ha) (40 bushels per acre) in 1900 to about 9.4 t/ha (150 bushels per acre) in 2001. Similarly, worldwide average wheat yields have increased from less than 1 t/ha in 1900 to more than 2.5 t/ha in 1990. South American average wheat yields are around 2 t/ha, African under 1 t/ha, and Egypt and Arabia up to 3.5 to 4 t/ha with irrigation. In contrast, the average wheat yield in countries such as France is over 8 t/ha. Variations in yields are due mainly to variation in climate, genetics, and the level of intensive farming techniques (use of fertilizers, chemical pest control, growth control to avoid lodging).
Genetically modified organisms (GMO) are organisms whose genetic material has been altered by genetic engineering techniques generally known as recombinant DNA technology. Genetic engineering has expanded the genes available to breeders to utilize in creating desired germlines for new crops. Increased durability, nutritional content, insect and virus resistance and herbicide tolerance are a few of the attributes bred into crops through genetic engineering. For some, GMO crops cause food safety and food labeling concerns. Numerous countries have placed restrictions on the production, import or use of GMO foods and crops, which have been put in place due to concerns over potential health issues, declining agricultural diversity and contamination of non-GMO crops. Currently a global treaty, the Biosafety Protocol, regulates the trade of GMOs. There is ongoing discussion regarding the labeling of foods made from GMOs, and while the EU currently requires all GMO foods to be labeled, the US does not.
Herbicide-resistant seed has a gene implanted into its genome that allows the plants to tolerate exposure to herbicides, including glyphosates. These seeds allow the farmer to grow a crop that can be sprayed with herbicides to control weeds without harming the resistant crop. Herbicide-tolerant crops are used by farmers worldwide. With the increasing use of herbicide-tolerant crops, comes an increase in the use of glyphosate-based herbicide sprays. In some areas glyphosate resistant weeds have developed, causing farmers to switch to other herbicides. Some studies also link widespread glyphosate usage to iron deficiencies in some crops, which is both a crop production and a nutritional quality concern, with potential economic and health implications.
Other GMO crops used by growers include insect-resistant crops, which have a gene from the soil bacterium Bacillus thuringiensis (Bt), which produces a toxin specific to insects. These crops protect plants from damage by insects. Some believe that similar or better pest-resistance traits can be acquired through traditional breeding practices, and resistance to various pests can be gained through hybridization or cross-pollination with wild species. In some cases, wild species are the primary source of resistance traits; some tomato cultivars that have gained resistance to at least 19 diseases did so through crossing with wild populations of tomatoes.
Agriculture, as implemented through the method of farming, imposes external costs upon society through pesticides, nutrient runoff, excessive water usage, loss of natural environment and assorted other problems. A 2000 assessment of agriculture in the UK determined total external costs for 1996 of £2,343 million, or £208 per hectare. A 2005 analysis of these costs in the USA concluded that cropland imposes approximately $5 to 16 billion ($30 to $96 per hectare), while livestock production imposes $714 million. Both studies, which focused solely on the fiscal impacts, concluded that more should be done to internalize external costs. Neither included subsidies in their analysis, but they noted that subsidies also influence the cost of agriculture to society. In 2010, the International Resource Panel of the United Nations Environment Programme published a report assessing the environmental impacts of consumption and production. The study found that agriculture and food consumption are two of the most important drivers of environmental pressures, particularly habitat change, climate change, water use and toxic emissions. The 2011 UNEP Green Economy report states that "[a]gricultural operations, excluding land use changes, produce approximately 13 per cent of anthropogenic global GHG emissions. This includes GHGs emitted by the use of inorganic fertilisers agro-chemical pesticides and herbicides; (GHG emissions resulting from production of these inputs are included in industrial emissions); and fossil fuel-energy inputs. "On average we find that the total amount of fresh residues from agricultural and forestry production for second- generation biofuel production amounts to 3.8 billion tonnes per year between 2011 and 2050 (with an average annual growth rate of 11 per cent throughout the period analysed, accounting for higher growth during early years, 48 per cent for 2011-2020 and an average 2 per cent annual expansion after 2020)." 
A senior UN official and co-author of a UN report detailing this problem, Henning Steinfeld, said "Livestock are one of the most significant contributors to today's most serious environmental problems". Livestock production occupies 70% of all land used for agriculture, or 30% of the land surface of the planet. It is one of the largest sources of greenhouse gases, responsible for 18% of the world's greenhouse gas emissions as measured in CO2 equivalents. By comparison, all transportation emits 13.5% of the CO2. It produces 65% of human-related nitrous oxide (which has 296 times the global warming potential of CO2,) and 37% of all human-induced methane (which is 23 times as warming as CO2.) It also generates 64% of the ammonia emission. Livestock expansion is cited as a key factor driving deforestation; in the Amazon basin 70% of previously forested area is now occupied by pastures and the remainder used for feedcrops. Through deforestation and land degradation, livestock is also driving reductions in biodiversity. Furthermore, the UNEP states that "methane emissions from global livestock are projected to increase by 60 per cent by 2030 under current practices and consumption patterns." 
Land and water issues
Land transformation, the use of land to yield goods and services, is the most substantial way humans alter the Earth's ecosystems, and is considered the driving force in the loss of biodiversity. Estimates of the amount of land transformed by humans vary from 39 to 50%. Land degradation, the long-term decline in ecosystem function and productivity, is estimated to be occurring on 24% of land worldwide, with cropland overrepresented. The UN-FAO report cites land management as the driving factor behind degradation and reports that 1.5 billion people rely upon the degrading land. Degradation can be deforestation, desertification, soil erosion, mineral depletion, or chemical degradation (acidification and salinization).
Eutrophication, excessive nutrients in aquatic ecosystems resulting in algal blooms and anoxia, leads to fish kills, loss of biodiversity, and renders water unfit for drinking and other industrial uses. Excessive fertilization and manure application to cropland, as well as high livestock stocking densities cause nutrient (mainly nitrogen and phosphorus) runoff and leaching from agricultural land. These nutrients are major nonpoint pollutants contributing to eutrophication of aquatic ecosystems.
Agriculture accounts for 70% of withdrawals of freshwater resources. Agriculture is a major draw on water from aquifers, and currently draws from those underground water sources at an unsustainable rate. It is long known that aquifers in areas as diverse as northern China, the Upper Ganges and the western US are being depleted, and new research extends these problems to aquifers in Iran, Mexico and Saudi Arabia. Increasing pressure is being placed on water resources by industry and urban areas, meaning that water scarcity is increasing and agriculture is facing the challenge of producing more food for the world's growing population with reduced water resources. Agricultural water usage can also cause major environmental problems, including the destruction of natural wetlands, the spread of water-borne diseases, and land degradation through salinization and waterlogging, when irrigation is performed incorrectly.
Pesticide use has increased since 1950 to 2.5 million tons annually worldwide, yet crop loss from pests has remained relatively constant. The World Health Organization estimated in 1992 that 3 million pesticide poisonings occur annually, causing 220,000 deaths. Pesticides select for pesticide resistance in the pest population, leading to a condition termed the 'pesticide treadmill' in which pest resistance warrants the development of a new pesticide.
An alternative argument is that the way to 'save the environment' and prevent famine is by using pesticides and intensive high yield farming, a view exemplified by a quote heading the Center for Global Food Issues website: 'Growing more per acre leaves more land for nature'. However, critics argue that a trade-off between the environment and a need for food is not inevitable, and that pesticides simply replace good agronomic practices such as crop rotation. The UNEP introduces the Push–pull agricultural pest management technique which involves intercropping that uses plant aromas to repel or push away pests while pulling in or attracting the right insects. "The implementation of push-pull in eastern Africa has significantly increased maize yields and the combined cultivation of N-fixing forage crops has enriched the soil and has also provided farmers with feed for livestock. With increased livestock operations, the farmers are able to produce meat, milk and other dairy products and they use the manure as organic fertiliser that returns nutrients to the fields." 
Climate change has the potential to affect agriculture through changes in temperature, rainfall (timing and quantity), CO2, solar radiation and the interaction of these elements. Extreme events, such as droughts and floods, are forecast to increase as climate change takes hold. Agriculture is among sectors most vulnerable to the impacts of climate change; water supply for example, will be critical to sustain agricultural production and provide the increase in food output required to sustain the world's growing population. Fluctuations in the flow of rivers are likely to increase in the twenty-first century. Based on the experience of countries in the Nile river basin (Ethiopia, Kenya and Sudan) and other developing countries, depletion of water resources during seasons crucial for agriculture can lead to a decline in yield by up to 50%. Transformational approaches will be needed to manage natural resources in the future. For example, policies, practices and tools promoting climate-smart agriculture will be important, as will better use of scientific information on climate for assessing risks and vulnerability. Planners and policy-makers will need to help create suitable policies that encourage funding for such agricultural transformation.
Agriculture in its many forms can both mitigate or worsen global warming. Some of the increase in CO2 in the atmosphere comes from the decomposition of organic matter in the soil, and much of the methane emitted into the atmosphere is caused by the decomposition of organic matter in wet soils such as rice paddies, as well as the normal digestive activities of farm animals. Further, wet or anaerobic soils also lose nitrogen through denitrification, releasing the greenhouse gases nitric oxide and nitrous oxide. Changes in management can reduce the release of these greenhouse gases, and soil can further be used to sequester some of the CO2 in the atmosphere. Informed by the UNEP, "[a]griculture also produces about 58 per cent of global nitrous oxide emissions and about 47 per cent of global methane emissions. Both of these gases have a far greater global warming potential per tonne than CO2 (298 times and 25 times respectively)." 
There are several factors within the field of agriculture that contribute to the large amount of CO2 emissions. The diversity of the sources ranges from the production of farming tools to the transport of harvested produce. Approximately 8% of the national carbon footprint is due to agricultural sources. Of that, 75% is of the carbon emissions released from the production of crop assisting chemicals. Factories producing insecticides, herbicides, fungicides, and fertilizers are a major culprit of the greenhouse gas. Productivity on the farm itself and the use of machinery is another source of the carbon emission. Almost all the industrial machines used in modern farming are powered by fossil fuels. These instruments are burning fossil fuels from the beginning of the process to the end. Tractors are the root of this source. The tractor is going to burn fuel and release CO2 just to run. The amount of emissions from the machinery increase with the attachment of different units and need for more power. During the soil preparation stage tillers and plows will be used to disrupt the soil. During growth watering pumps and sprayers are used to keep the crops hydrated. And when the crops are ready for picking a forage or combine harvester is used. These types of machinery all require additional energy which leads to increased carbon dioxide emissions from the basic tractors. The final major contribution to CO2 emissions in agriculture is in the final transport of produce. Local farming suffered a decline over the past century due to large amounts of farm subsidies. The majority of crops are shipped hundreds of miles to various processing plants before ending up in the grocery store. These shipments are made using fossil fuel burning modes of transportation. Inevitably these transport adds to carbon dioxide emissions.
Some major organizations are hailing farming within agroecosystems as the way forward for mainstream agriculture. Current farming methods have resulted in over-stretched water resources, high levels of erosion and reduced soil fertility. According to a report by the International Water Management Institute and UNEP, there is not enough water to continue farming using current practices; therefore how critical water, land, and ecosystem resources are used to boost crop yields must be reconsidered. The report suggested assigning value to ecosystems, recognizing environmental and livelihood tradeoffs, and balancing the rights of a variety of users and interests. Inequities that result when such measures are adopted would need to be addressed, such as the reallocation of water from poor to rich, the clearing of land to make way for more productive farmland, or the preservation of a wetland system that limits fishing rights.
Technological advancements help provide farmers with tools and resources to make farming more sustainable. New technologies have given rise to innovations like conservation tillage, a farming process which helps prevent land loss to erosion, water pollution and enhances carbon sequestration.
According to a report by the International Food Policy Research Institute (IFPRI), agricultural technologies will have the greatest impact on food production if adopted in combination with each other; using a model that assessed how eleven technologies could impact agricultural productivity, food security and trade by 2050, IFPRI found that the number of people at risk from hunger could be reduced by as much as 40% and food prices could be reduced by almost half.
Agricultural economics refers to economics as it relates to the "production, distribution and consumption of [agricultural] goods and services". Combining agricultural production with general theories of marketing and business as a discipline of study began in the late 1800s, and grew significantly through the 20th century. Although the study of agricultural economics is relatively recent, major trends in agriculture have significantly affected national and international economies throughout history, ranging from tenant farmers and sharecropping in the post-American Civil War Southern United States to the European feudal system of manorialism. In the United States, and elsewhere, food costs attributed to food processing, distribution, and agricultural marketing, sometimes referred to as the value chain, have risen while the costs attributed to farming have declined. This is related to the greater efficiency of farming, combined with the increased level of value addition (e.g. more highly processed products) provided by the supply chain. Market concentration has increased in the sector as well, and although the total effect of the increased market concentration is likely increased efficiency, the changes redistribute economic surplus from producers (farmers) and consumers, and may have negative implications for rural communities.
National government policies can significantly change the economic marketplace for agricultural products, in the form of taxation, subsidies, tariffs and other measures. Since at least the 1960s, a combination of import/export restrictions, exchange rate policies and subsidies have affected farmers in both the developing and developed world. In the 1980s, it was clear that non-subsidized farmers in developing countries were experiencing adverse affects from national policies that created artificially low global prices for farm products. Between the mid-1980s and the early 2000s, several international agreements were put into place that limited agricultural tariffs, subsidies and other trade restrictions.
However, as of 2009[update], there was still a significant amount of policy-driven distortion in global agricultural product prices. The three agricultural products with the greatest amount of trade distortion were sugar, milk and rice, mainly due to taxation. Among the oilseeds, sesame had the greatest amount of taxation, but overall, feed grains and oilseeds had much lower levels of taxation than livestock products. Since the 1980s, policy-driven distortions have seen a greater decrease among livestock products than crops during the worldwide reforms in agricultural policy. Despite this progress, certain crops, such as cotton, still see subsidies in developed countries artificially deflating global prices, causing hardship in developing countries with non-subsidized farmers. Unprocessed commodities (i.e. corn, soybeans, cows) are generally graded to indicate quality. The quality affects the price the producer receives. Commodities are generally reported by production quantities, such as volume, number or weight.
Agricultural science is a broad multidisciplinary field of biology that encompasses the parts of exact, natural, economic and social sciences that are used in the practice and understanding of agriculture. (Veterinary science, but not animal science, is often excluded from the definition.)
List of countries by agricultural output
Countries by agricultural output in 2015 (billions in USD)
|(—) European Union||
|(03) United States||
Energy and agriculture
Since the 1940s, agricultural productivity has increased dramatically, due largely to the increased use of energy-intensive mechanization, fertilizers and pesticides. The vast majority of this energy input comes from fossil fuel sources. Between the 1960–65 measuring cycle and the cycle from 1986 to 1990, the Green Revolution transformed agriculture around the globe, with world grain production increasing significantly (between 70% and 390% for wheat and 60% to 150% for rice, depending on geographic area) as world population doubled. Modern agriculture's heavy reliance on petrochemicals and mechanization has raised concerns that oil shortages could increase costs and reduce agricultural output, causing food shortages.
|Agriculture and food system share (%) of total energy
consumption by three industrialized nations
(direct & indirect)
Modern or industrialized agriculture is dependent on fossil fuels in two fundamental ways: 1. direct consumption on the farm and 2. indirect consumption to manufacture inputs used on the farm. Direct consumption includes the use of lubricants and fuels to operate farm vehicles and machinery; and use of gasoline, liquid propane, and electricity to power dryers, pumps, lights, heaters, and coolers. American farms directly consumed about 1.2 exajoules (1.1 quadrillion BTU) in 2002, or just over 1% of the nation's total energy.
Indirect consumption is mainly oil and natural gas used to manufacture fertilizers and pesticides, which accounted for 0.6 exajoules (0.6 quadrillion BTU) in 2002. The natural gas and coal consumed by the production of nitrogen fertilizer can account for over half of the agricultural energy usage. China utilizes mostly coal in the production of nitrogen fertilizer, while most of Europe uses large amounts of natural gas and small amounts of coal. According to a 2010 report published by The Royal Society, agriculture is increasingly dependent on the direct and indirect input of fossil fuels. Overall, the fuels used in agriculture vary based on several factors, including crop, production system and location. The energy used to manufacture farm machinery is also a form of indirect agricultural energy consumption. Together, direct and indirect consumption by US farms accounts for about 2% of the nation's energy use. Direct and indirect energy consumption by U.S. farms peaked in 1979, and has gradually declined over the past 30 years. Food systems encompass not just agricultural production, but also off-farm processing, packaging, transporting, marketing, consumption, and disposal of food and food-related items. Agriculture accounts for less than one-fifth of food system energy use in the US.
Mitigation of effects of petroleum shortages
In the event of a petroleum shortage (see peak oil for global concerns), organic agriculture can be more attractive than conventional practices that use petroleum-based pesticides, herbicides, or fertilizers. Some studies using modern organic-farming methods have reported yields as high as those available from conventional farming. In the aftermath of the fall of the Soviet Union, with shortages of conventional petroleum-based inputs, Cuba made use of mostly organic practices, including biopesticides, plant-based pesticides and sustainable cropping practices, to feed its populace. However, organic farming may be more labor-intensive and would require a shift of the workforce from urban to rural areas. The reconditioning of soil to restore nutrients lost during the use of monoculture agriculture techniques also takes time.
It has been suggested that rural communities might obtain fuel from the biochar and synfuel process, which uses agricultural waste to provide charcoal fertilizer, some fuel and food, instead of the normal food vs. fuel debate. As the synfuel would be used on-site, the process would be more efficient and might just provide enough fuel for a new organic-agriculture fusion.
It has been suggested that some transgenic plants may some day be developed which would allow for maintaining or increasing yields while requiring fewer fossil-fuel-derived inputs than conventional crops. The possibility of success of these programs is questioned by ecologists and economists concerned with unsustainable GMO practices such as terminator seeds. While there has been some research on sustainability using GMO crops, at least one prominent multi-year attempt by Monsanto Company has been unsuccessful, though during the same period traditional breeding techniques yielded a more sustainable variety of the same crop.
Agricultural policy is the set of government decisions and actions relating to domestic agriculture and imports of foreign agricultural products. Governments usually implement agricultural policies with the goal of achieving a specific outcome in the domestic agricultural product markets. Some overarching themes include risk management and adjustment (including policies related to climate change, food safety and natural disasters), economic stability (including policies related to taxes), natural resources and environmental sustainability (especially water policy), research and development, and market access for domestic commodities (including relations with global organizations and agreements with other countries). Agricultural policy can also touch on food quality, ensuring that the food supply is of a consistent and known quality, food security, ensuring that the food supply meets the population's needs, and conservation. Policy programs can range from financial programs, such as subsidies, to encouraging producers to enroll in voluntary quality assurance programs.
There are many influences on the creation of agricultural policy, including consumers, agribusiness, trade lobbies and other groups. Agribusiness interests hold a large amount of influence over policy making, in the form of lobbying and campaign contributions. Political action groups, including those interested in environmental issues and labor unions, also provide influence, as do lobbying organizations representing individual agricultural commodities. The Food and Agriculture Organization of the United Nations (FAO) leads international efforts to defeat hunger and provides a forum for the negotiation of global agricultural regulations and agreements. Dr. Samuel Jutzi, director of FAO's animal production and health division, states that lobbying by large corporations has stopped reforms that would improve human health and the environment. For example, proposals in 2010 for a voluntary code of conduct for the livestock industry that would have provided incentives for improving standards for health, and environmental regulations, such as the number of animals an area of land can support without long-term damage, were successfully defeated due to large food company pressure.
- Agricultural engineering
- Agricultural value chain
- Building-integrated agriculture
- Contract farming
- Corporate farming
- Feed additive
- Food security
- Hill farming
- List of documentary films about agriculture
- Pharming (genetics)
- Remote sensing
- Subsistence economy
- Vertical farming
- Safety and health in agriculture. International Labour Organization. 1999. pp. 77–. ISBN 978-92-2-111517-5. Retrieved 13 September 2010.
- Chantrell, Glynnis, ed. (2002). The Oxford Dictionary of Word Histories. Oxford University Press. p. 14. ISBN 0-19-863121-9.
- Ulrich G. Mueller, Nicole M. Gerardo, Duur K. Aanen, Diana L. Six, and Ted R. Schultz (December 2005). "The Evolution of Agriculture in Insects". Annual Review of Ecology, Evolution, and Systematics 36: 563–595. doi:10.1146/annurev.ecolsys.36.102003.152626.
- "Definition of Agriculture". State of Maine. Retrieved 6 May 2013.
- Committee on Forestry Research, National Research Council (1990). Forestry Research: A Mandate for Change. National Academies Press. pp. 15–16. ISBN 0-309-04248-8.
- Budowski, Gerardo (1982). "Applicability of agro-forestry systems". In MacDonald, L.H. Agro-forestry in the African Humid Tropics. United Nations University. ISBN 92-808-0364-6.
- "Farming Was So Nice, It Was Invented at Least Twice". Science. 4 July 2013.
- In particular, the history of maize cultivation in southern Mexico dates back 9000 years. New York Times, accessdate=2010-5-4
- Ancient Egyptian Literature: A Book of Readings, (ed. Miriam Lichtheim, Berkeley & Los Angeles & London: University of California Press, 1975, vol I, p 205-209).
- Han Agriculture: The Foundation of Early Chinese Agrarian Economy, 206 BC – AD 220, (ed. Cho-yun Hsu, Seattle & London: University of Washington Press, p 169-170).
- Guan Zhong, Guanzi: Economic Dialogues in Ancient China, (trs. Po-fu Tan, & Kuang-wen Wen, Connecticut: New Heaven, 1954, p 174); Samuel Noah Kramer, History Begins at Sumer: Thirty-Nine Firsts in Man's Recorded History,, New York: University of Pennsylvania Press, 1953, p 96-97; Rafael Karsten, A Totalitarian State of the Past: The Civilization of the Inca Empire in Ancient Peru, Helsingforce: Academic Bookstore, 1949, p 93, 181).
- Max Ostrovsky, Y = Arctg X: The Hyperbola of the World Order, (Lanham; University Press of America, 2007, p 89).
- Guanzi: Economic Dialogues in Ancient China, (trs. Po-fu Tan, & Kuang-wen Wen, Connecticut: New Heaven, 1954, p 94, 129-130, 156-157, 362).
- The Book of the Governor of the Shang Region,( tr. L. S. Perelomov, Moscow: Nauka, 1993, p 153).
- Arthashastra, (tr. T. N. Ramaswamy, London: Asia Publishers, 1962, p 126, 128).
- One chapter Shang Yang titled "Reflections on the One," The Book of the Governor of the Shang Region, (p 150).
- The Mesopotamian Lahmu; the Hittite goddess ofArinna, and the Roman Janus. From Lahmu derive two Hebrew words—warfare (lehima) and bread (lehem).
- Max Ostrovsky, Y = Arctg X: The Hyperbola of the World Order, (Lanham; University Press of America, 2007, p 64-66).
- Barrington Moore, Social Origins of Democracy and Dictatorship, (London: Penguin Books, 1967, p 429; Shepard B. Clough & Richard T. Rapp, European Economic History: The Economic Development of Western Civilization, (London & Sydney: McGraw-Hill, 1968, p 258).
- Max Ostrovsky, Y = Arctg X: The Hyperbola of the World Order, (Lanham; University Press of America, 2007, p 117-118).
- The Axial belt shifted northward due to climatic change and penetrated into temperate North America after Columbus. Y = Arctg X: The Hyperbola of the World Order, (p 111, 126).
- Y = Arctg X: The Hyperbola of the World Order, p 111, 126)
- Max Ostrovsky, Y = Arctg X: The Hyperbola of the World Order, (p 119-120)
- The two superpowers were in class of their own in their cereal area but not in any other resource or combination of resources. Y = Arctg X: The Hyperbola of the World Order, (p 158-159).
- The Final Fall: An Essay on the Decomposition of the Soviet Sphere, (New York: Karz Publishers, 1976, p 3, 5-6).
- Philpott, Tom (19 April 2013). "A Brief History of Our Deadly Addiction to Nitrogen Fertilizer". Mother Jones. Retrieved 7 May 2013.
- Scheierling, Susanne M. (1995). "Overcoming agricultural pollution of water: the challenge of integrating agricultural and environmental policies in the European Union, Volume 1". The World Bank. Retrieved 15 April 2013.
- "CAP Reform". European Commission. 2003. Retrieved 15 April 2013.
- Smith, Kate; Edwards, Rob (8 March 2008). "2008: The year of global food crisis". The Herald (Glasgow).
- "The global grain bubble". The Christian Science Monitor. 18 January 2008. Retrieved 26 September 2013.
- "The cost of food: Facts and figures". BBC News Online. 16 October 2008. Retrieved 26 September 2013.
- Walt, Vivienne (27 February 2008). "The World's Growing Food-Price Crisis". Time.
- Watts, Jonathan (4 December 2007). "Riots and hunger feared as demand for grain sends food costs soaring", The Guardian (London).
- Mortished, Carl (7 March 2008)."Already we have riots, hoarding, panic: the sign of things to come?", The Times (London).
- Borger, Julian (26 February 2008). "Feed the world? We are fighting a losing battle, UN admits", The Guardian (London).
- "Food prices: smallholder farmers can be part of the solution". International Fund for Agricultural Development. Retrieved 24 April 2013.
- "Wheat Stem Rust – UG99 (Race TTKSK)". FAO. Retrieved 6 January 2014.
- Sample, Ian (31 August 2007). "Global food crisis looms as climate change and population growth strip fertile land", The Guardian (London).
- "Africa may be able to feed only 25% of its population by 2025", mongabay.com, 14 December 2006.
- M. Pietrzak, D. Walczak. 2014. The Analysis of the Agrarian Structure in Poland with the Special Consideration of the Years 1921 and 2002, Bulgarian Journal of Agricultural Science, Vol 20, No 5, pp. 1025, 1038.
- "Agricultural Productivity in the United States". USDA Economic Research Service. 5 July 2012. Retrieved 22 April 2013.
- "Safety and health in agriculture". International Labour Organization. 21 March 2011. Retrieved 24 April 2013.
- AP (26 January 2007). "Services sector overtakes farming as world's biggest employer: ILO". The Financial Express. Retrieved 24 April 2013.
- "Labor Force – By Occupation". The World Factbook. Central Intelligence Agency. Retrieved 4 May 2013.
- Allen, Robert C. "Economic structure and agricultural productivity in Europe, 1300–1800" (PDF). European Review of Economic History 3: 1–25.
- "NIOSH Workplace Safety & Health Topic: Agricultural Injuries". Centers for Disease Control and Prevention. Retrieved 16 April 2013.
- "NIOSH Pesticide Poisoning Monitoring Program Protects Farmworkers". Centers for Disease Control and Prevention. Retrieved 15 April 2013.
- "NIOSH Workplace Safety & Health Topic: Agriculture". Centers for Disease Control and Prevention. Retrieved 16 April 2013.
- "Agriculture: A hazardous work". International Labour Organization. 15 June 2009. Retrieved 24 April 2013.
- "Analysis of farming systems". Food and Agriculture Organization. Retrieved 22 May 2013.
- Acquaah, G. 2002. Agricultural Production Systems. pp. 283–317 in "Principles of Crop Production, Theories, Techniques and Technology". Prentice Hall, Upper Saddle River, NJ.
- Chrispeels, M.J.; Sadava, D.E. 1994. "Farming Systems: Development, Productivity, and Sustainability". pp. 25–57 in Plants, Genes, and Agriculture. Jones and Bartlett, Boston, MA.
- "Food and Agriculture Organization of the United Nations (FAOSTAT)". Archived from the original on 18 January 2013. Retrieved 2 February 2013.
- Sere, C.; Steinfeld, H.; Groeneweld, J. (1995). "Description of Systems in World Livestock Systems – Current status issues and trends". U.N. Food and Agriculture Organization. Retrieved 8 September 2013.
- Thornton, Philip K. (27 September 2010). "Livestock production: recent trends, future prospects". Philosophical Transactions of the Royal Society B 365 (1554). doi:10.1098/rstb.2010.0134.
- Stier, Ken (19 September 2007). "Fish Farming's Growing Dangers". Time.
- P. Ajmone-Marsan (May 2010). "A global view of livestock biodiversity and conservation – GLOBALDIV". Animal Genetics 41 (supplement S1): 1–5. doi:10.1111/j.1365-2052.2010.02036.x.
- "Growth Promoting Hormones Pose Health Risk to Consumers, Confirms EU Scientific Committee" (PDF). European Union. 23 April 2002. Retrieved 6 April 2013.
- Brady, N.C. and R.R. Weil. 2002. Elements of the Nature and Properties of Soils. Pearson Prentice Hall, Upper Saddle River, NJ.
- Acquaah, G. 2002. "Land Preparation and Farm Energy" pp.318–338 in Principles of Crop Production, Theories, Techniques and Technology. Prentice Hall, Upper Saddle River, NJ.
- Acquaah, G. 2002. "Pesticide Use in U.S. Crop Production" pp.240–282 in Principles of Crop Production, Theories, Techniques and Technology. Prentice Hall, Upper Saddle River, NJ.
- Acquaah, G. 2002. "Soil and Land" pp.165–210 in Principles of Crop Production, Theories, Techniques and Technology. Prentice Hall, Upper Saddle River, NJ.
- Chrispeels, M.J.; Sadava, D.E. 1994. "Nutrition from the Soil" pp.187–218 in Plants, Genes, and Agriculture. Jones and Bartlett, Boston, MA.
- Brady, N.C.; Weil, R.R. 2002. "Practical Nutrient Management" pp.472–515 in Elements of the Nature and Properties of Soils. Pearson Prentice Hall, Upper Saddle River, NJ.
- Acquaah, G. 2002. "Plants and Soil Water" pp.211–239 in Principles of Crop Production, Theories, Techniques and Technology. Prentice Hall, Upper Saddle River, NJ.
- Pimentel, D.; Berger, D.; Filberto, D.; Newton, M.; et al. (2004). "Water Resources: Agricultural and Environmental Issues". BioScience 54 (10): 909–918. doi:10.1641/0006-3568(2004)054[0909:WRAAEI]2.0.CO;2.
- International Food Policy Research Institute (2014). "Food Security in a World of Growing Natural Resource Scarcity". CropLife International. Retrieved 1 July 2013.
- UNEP, 2011, Towards a Green Economy: Pathways to Sustainable Development and Poverty Eradication, www.unep.org/greeneconomy
- "History of Plant Breeding". Colorado State University. 29 January 2004. Retrieved 11 May 2013.
- Stadler, L. J.; Sprague, G.F. (15 October 1936). "Genetic Effects of Ultra-Violet Radiation in Maize: I. Unfiltered Radiation" (PDF). Proceedings of the National Academy of Sciences of the United States of America (US Department of Agriculture and Missouri Agricultural Experiment Station) 22 (10): 572–578. doi:10.1073/pnas.22.10.572. PMC 1076819. PMID 16588111. Archived (PDF) from the original on 24 October 2007. Retrieved 11 October 2007.
- Berg, Paul; Singer, Maxine (15 August 2003). George Beadle: An Uncommon Farmer. The Emergence of Genetics in the 20th century. Cold Springs Harbor Laboratory Press. ISBN 978-0-87969-688-7.
- Ruttan, Vernon W. (December 1999). "Biotechnology and Agriculture: A Skeptical Perspective" (PDF). AgBioForum 2 (1): 54–60.
- Cassman, K. (5 December 1998). "Ecological intensification of cereal production systems: The Challenge of increasing crop yield potential and precision agriculture". Proceedings of a National Academy of Sciences Colloquium, Irvine, California (University of Nebraska). Archived from the original on 24 October 2007. Retrieved 11 October 2007.
- Conversion note: 1 bushel of wheat = 60 pounds (lb) ≈ 27.215 kg. 1 bushel of maize = 56 pounds ≈ 25.401 kg
- "20 Questions on Genetically Modified Foods". World Health Organization. Retrieved 16 April 2013.
- Whiteside, Stephanie (28 November 2012). "Peru bans genetically modified foods as US lags". Current TV. Retrieved 7 May 2013.
- Shiva, Vandana (2005). Earth Democracy: Justice, Sustainability, and Peace. Cambridge, MA: South End Press.
- Kathrine Hauge Madsen and Jens Carl Streibig. "Benefits and risks of the use of herbicide-resistant crops". Weed Management for Developing Countries. FAO. Retrieved 4 May 2013.
- "Farmers Guide to GMOs" (PDF). Rural Advancement Foundation International. Retrieved 16 April 2013.
- Brian Hindo (13 February 2008). "Report Raises Alarm over 'Super-weeds'". Bloomberg BusinessWeek.
- Ozturk; et al. (2008). "Glyphosate inhibition of ferric reductase activity in iron deficient sunflower roots". New Phytologist 177: 899–906. doi:10.1111/j.1469-8137.2007.02340.x.
- "Insect-resistant Crops Through Genetic Engineering". University of Illinois. Retrieved 4 May 2013.
- Kimbrell, A. (2002). Fatal Harvest: The Tragedy of Industrial Agriculture. Washington: Island Press.
- Pretty, J; et al. (2000). "An assessment of the total external costs of UK agriculture". Agricultural Systems 65 (2): 113–136. doi:10.1016/S0308-521X(00)00031-7.
- Tegtmeier, E.M.; Duffy, M. (2005). "External Costs of Agricultural Production in the United States" (PDF). The Earthscan Reader in Sustainable Agriculture.
- International Resource Panel (2010). "Priority products and materials: assessing the environmental impacts of consumption and production". United Nations Environment Programme. Retrieved 7 May 2013.
- "Livestock a major threat to environment". UN Food and Agriculture Organization. 29 November 2006. Archived from the original on 28 March 2008. Retrieved 24 April 2013.
- Steinfeld, H.; Gerber, P.; Wassenaar, T.; Castel, V.; Rosales, M.; de Haan, C. (2006). "Livestock's Long Shadow – Environmental issues and options" (PDF). Rome: U.N. Food and Agriculture Organization. Archived from the original (PDF) on 25 June 2008. Retrieved 5 December 2008.
- Vitousek, P.M.; Mooney, H.A.; Lubchenco, J.; Melillo, J.M. (1997). "Human Domination of Earth's Ecosystems". Science 277 (5325): 494–499. doi:10.1126/science.277.5325.494.
- Bai, Z.G., D.L. Dent, L. Olsson, and M.E. Schaepman (November 2008). "Global assessment of land degradation and improvement: 1. identification by remote sensing" (PDF). FAO/ISRIC. Retrieved 24 May 2013.
- Carpenter, S.R., N.F. Caraco, D.L. Correll, R.W. Howarth, A.N. Sharpley, and V.H. Smith (1998). "Nonpoint Pollution of Surface Waters with Phosphorus and Nitrogen". Ecological Applications 8 (3): 559–568. doi:10.1890/1051-0761(1998)008[0559:NPOSWW]2.0.CO;2.
- Molden, D. (ed.). "Findings of the Comprehensive Assessment of Water Management in Agriculture" (PDF). Annual Report 2006/2007. International Water Management Institute. Retrieved 6 January 2014.
- Li, Sophia (13 August 2012). "Stressed Aquifers Around the Globe". New York Times. Retrieved 7 May 2013.
- "Water Use in Agriculture". FAO. November 2005. Retrieved 7 May 2013.
- "Water Management: Towards 2030". FAO. March 2003. Retrieved 7 May 2013.
- Pimentel, D. T.W. Culliney, and T. Bashore (1996). "Public health risks associated with pesticides and natural toxins in foods". Radcliffe's IPM World Textbook. Retrieved 7 May 2013.
- WHO. 1992. Our planet, our health: Report of the WHO commission on health and environment. Geneva: World Health Organization.
- Chrispeels, M.J. and D.E. Sadava. 1994. "Strategies for Pest Control" pp.355–383 in Plants, Genes, and Agriculture. Jones and Bartlett, Boston, MA.
- Avery, D.T. (2000). Saving the Planet with Pesticides and Plastic: The Environmental Triumph of High-Yield Farming. Indianapolis, IN: Hudson Institute.
- "Home". Center for Global Food Issues. Retrieved 24 May 2013.
- Lappe, F.M., J. Collins, and P. Rosset. 1998. "Myth 4: Food vs. Our Environment" pp. 42–57 in World Hunger, Twelve Myths, Grove Press, New York.
- Harvey, Fiona (18 November 2011). "Extreme weather will strike as climate change takes hold, IPCC warns". The Guardian.
- "Report: Blue Peace for the Nile" (PDF). Strategic Foresight Group. Retrieved 20 August 2013.
- "World: Pessimism about future grows in agribusiness".
- "SREX: Lessons for the agricultural sector". Climate & Development Knowledge Network. Retrieved 24 May 2013.
- Brady, N.C. and R.R. Weil. 2002. "Soil Organic Matter" pp. 353–385 in Elements of the Nature and Properties of Soils. Pearson Prentice Hall, Upper Saddle River, NJ.
- Brady, N.C. and R.R. Weil. 2002. "Nitrogen and Sulfur Economy of Soils" pp. 386–421 in Elements of the Nature and Properties of Soils. Pearson Prentice Hall, Upper Saddle River, NJ.
- Hillier, Jonathon; C. Hawes; G. Squire; A. Hilton (2009). "The carbon footprints of food crop production". International Journal of Agricultural Sustainability 7 (2): 107–118. doi:10.3763/ijas.2009.0419.
- Lal, Rattan (2004). "Carbon emission from farm operations". Environmental International 30 (7): 981–990. doi:10.1016/j.envint.2004.03.005.
- West, T.O.; G. Marland (2002). "Net carbon flux from agricultural ecosystems: methodology for full carbon cycle analyses". Environmental Pollution 116 (3): 439–444. doi:10.1016/s0269-7491(01)00221-4.
- Boelee, E. (Ed) (2011). "Ecosystems for water and food security". IWMI/UNEP. Retrieved 24 May 2013.
- Molden, D. "Opinion: The Water Deficit" (PDF). The Scientist. Retrieved 23 August 2011.
- Safefood Consulting, Inc. (2005). "Benefits of Crop Protection Technologies on Canadian Food Production, Nutrition, Economy and the Environment". CropLife International. Retrieved 24 May 2013.
- Trewavas, Anthony (2004). "A critical assessment of organic farming-and-food assertions with particular respect to the UK and the potential environmental benefits of no-till agriculture". Crop Protection 23 (9): 757–781. doi:10.1016/j.cropro.2004.01.009.
- "Agricultural Economics". University of Idaho. Retrieved 16 April 2013.
- Runge, C. Ford (June 2006). "Agricultural Economics: A Brief Intellectual History" (PDF). Center for International Food and Agriculture Policy. p. 4. Retrieved 16 September 2013.
- Conrad, David E. "Tenant Farming and Sharecropping". Encyclopedia of Oklahoma History and Culture. Oklahoma Historical Society. Retrieved 16 September 2013.
- Stokstad, Marilyn (2005). Medieval Castles. Greenwood Publishing Group. ISBN 0-313-32525-1.
- Sexton, R.J. (2000). "Industrialization and Consolidation in the US Food Sector: Implications for Competition and Welfare". American Journal of Agricultural Economics 82 (5): 1087–1104. doi:10.1111/0002-9092.00106.
- Peter J. Lloyd, Johanna L. Croser, Kym Anderson (March 2009). "How Do Agricultural Policy Restrictions to Global Trade and Welfare Differ across Commodities?" (PDF). Policy Research Working Paper #4864. The World Bank. pp. 2–3. Retrieved 16 April 2013.
- Kym Anderson and Ernesto Valenzuela (April 2006). "Do Global Trade Distortions Still Harm Developing Country Farmers?" (PDF). World Bank Policy Research Working Paper 3901. World Bank. pp. 1–2. Retrieved 16 April 2013.
- Peter J. Lloyd, Johanna L. Croser, Kym Anderson (March 2009). "How Do Agricultural Policy Restrictions to Global Trade and Welfare Differ across Commodities?" (PDF). Policy Research Working Paper #4864. The World Bank. p. 21. Retrieved 16 April 2013.
- Glenys Kinnock (24 May 2011). "America's $24bn subsidy damages developing world cotton farmers". The Guardian. Retrieved 16 April 2013.
- "Agriculture's Bounty" (PDF). May 2013. Retrieved 19 August 2013.
- "World oil supplies are set to run out faster than expected, warn scientists". The Independent. 14 June 2007.
- Robert W. Herdt (30 May 1997). "The Future of the Green Revolution: Implications for International Grain Markets" (PDF). The Rockefeller Foundation. p. 2. Retrieved 16 April 2013.
- Schnepf, Randy (19 November 2004). "Energy use in Agriculture: Background and Issues" (PDF). CRS Report for Congress. Congressional Research Service. Retrieved 26 September 2013.
- Rebecca White (2007). "Carbon governance from a systems perspective: an investigation of food production and consumption in the UK" (PDF). Oxford University Center for the Environment.
- Martin Heller and Gregory Keoleian (2000). "Life Cycle-Based Sustainability Indicators for Assessment of the U.S. Food System" (PDF). University of Michigan Center for Sustainable Food Systems.
- Patrick Canning, Ainsley Charles, Sonya Huang, Karen R. Polenske, and Arnold Waters (2010). "Energy Use in the U.S. Food System". USDA Economic Research Service Report No. ERR-94. United States Department of Agriculture.
- Wallgren, Christine; Höjer, Mattias (2009). "Eating energy—Identifying possibilities for reduced energy use in the future food supply system". Energy Policy 37 (12): 5803–5813. doi:10.1016/j.enpol.2009.08.046. ISSN 0301-4215.
- Jeremy Woods, Adrian Williams, John K. Hughes, Mairi Black and Richard Murphy (August 2010). "Energy and the food system". Philosophical Transactions of the Royal Society 365 (1554): 2991–3006. doi:10.1098/rstb.2010.0172.
- "World oil supplies are set to run out faster than expected, warn scientists". The Independent. 14 June 2007.
- "Can Sustainable Agriculture Really Feed the World?". University of Minnesota. August 2010. Retrieved 15 April 2013.
- "Cuban Organic Farming Experiment". Harvard School of Public Health. Retrieved 15 April 2013.
- Strochlic, R.; Sierra, L. (2007). "Conventional, Mixed, and "Deregistered" Organic Farmers: Entry Barriers and Reasons for Exiting Organic Production in California" (PDF). California Institute for Rural Studies. Retrieved 15 April 2013.
- P. Read (2005). "Carbon cycle management with increased photo-synthesis and long-term sinks" (PDF). Geophysical Research Abstracts 7: 11082.
- Greene, Nathanael (December 2004). "How biofuels can help end America's energy dependence". Biotechnology Industry Organization.
- Srinivas (June 2008). "Reviewing The Methodologies For Sustainable Living" 7. The Electronic Journal of Environmental, Agricultural and Food Chemistry.
- R. Pillarisetti and Kylie Radel (June 2004). "Economic and Environmental Issues in International Trade and Production of Genetically Modified Foods and Crops and the WTO" 19 (2). Journal of Economic Integration. pp. 332–352.
- Conway, G. (2000). "Genetically modified crops: risks and promise". 4(1): 2. Conservation Ecology.
- "Monsanto failure". New Scientist 181 (2433) (London). 7 February 2004. Retrieved 18 April 2008.
- Lindsay Hogan and Paul Morris (October 2010). "Agricultural and food policy choices in Australia" (PDF). Sustainable agriculture and food policy in the 21st century: challenges and solutions (Australian Bureau of Agricultural and Resource Economics – Bureau of Rural Sciences): 13. Retrieved 22 April 2013.
- "Agriculture: Not Just Farming ...". European Union. Retrieved 22 April 2013.
- Ikerd, John (2010). "Corporatization of Agricultural Policy". Small Farm Today Magazine.
- Jowit, Juliette (22 September 2010). "Corporate Lobbying Is Blocking Food Reforms, Senior UN Official Warns: Farming Summit Told of Delaying Tactics by Large Agribusiness and Food Producers on Decisions that Would Improve Human Health and the Environment". The Guardian (London).
- Alvarez, Robert A (2007). "The March of Empire: Mangos, Avocados, and the Politics of Transfer". Gastronomica 7 (3): 28–33. doi:10.1525/gfc.2007.7.3.28.
- Bolens, L. (1997). "Agriculture" in Selin, Helaine (ed.), Encyclopedia of the History of Science, Technology, and Medicine in Non-Western Cultures. Kluwer Academic Publishers, Dordrecht/Boston/London, pp. 20–22.
- Collinson, M. (ed.) A History of Farming Systems Research. CABI Publishing, 2000. ISBN 978-0-85199-405-5
- Jared Diamond, Guns, germs and steel. A short history of everybody for the last 13,000 years, 1997.
- Mazoyer, Marcel; Roudart, Laurence (2006). A history of world agriculture: from the Neolithic Age to the current crisis. Monthly Review Press, New York. ISBN 978-1-58367-121-4
- Watson, A.M. (1983). Agricultural Innovation in the Early Islamic World, Cambridge University Press.
|Wikimedia Commons has media related to Agriculture.|
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|Look up agriculture in Wiktionary, the free dictionary.|
|Wikiversity has learning materials about Agriculture at|
- Official website of the Food and Agriculture Organization (FAO) of the United Nations
- Official website of the United States Department of Agriculture (USDA)
- Agriculture Research Guide from the Government Information Library of the University of Colorado, Boulder
- Agriculture material from the World Bank Group
- Agriculture collected news and commentary at The New York Times
- Agriculture collected news and commentary at The Guardian