Instruct: Given a question, retrieve relevant documents that can help answer the question.
Query: What is the largest crop produced by the US?
Corn for grain, average of 160.4 bushels harvested per acre (10.07 t/ha) Soybean for beans, average of 42.5 bushels harvested per acre (2.86 t/ha) Wheat, average of 43.2 bushels harvested per acre (2.91 t/ha, was 44.2 bu/ac or 2.97 t/ha in 2003)
The region is one of the most important areas of pastoral farming in New Zealand. It had 7,216,177 sheep (at 30 June 1996), the largest number of sheep in the North Island and the fourth-highest figure in the country behind Canterbury, Southland and Otago. The region also produces a significant proportion of vegetables in the North Island and is particularly noted for its abundant potato crop. Barley, which is used for the manufacture of stock feed and for malting, is grown. The region produces the largest quantities of barley in the North Island, providing 10% of the national refined crop of 302,804 tonnes in 1995.
The wide range of temperature fluctuation in different parts of the country and the multiplicity of climatic zones make it possible to cultivate a diverse variety of crops, including cereals (wheat, barley, rice, and maize (corn)), fruits (dates, figs, pomegranates, melons, and grapes), vegetables, cotton, sugar beets, sugarcane and pistachios (World's largest producer with 40% of the world's output in 2005), nuts, olives, spices e.g. saffron (World's largest producer with 81% of the world's total output), raisin(world's third largest producer & second largest exporter), tea, tobacco, Berberis(world's largest producer) and medicinal herbs. More than 2,000 plant species are grown in Iran; only 100 of which are being used in pharmaceutical industries. The land covered by Iran's natural flora is four times that of Europe.
Grain sorghum is the third most important cereal crop grown in the United States and the fifth most important cereal crop grown in the world. In 2010, Nigeria was the world's largest producer of grain sorghum, followed by the United States and India. In developed countries, and increasingly in developing countries such as India, the predominant use of sorghum is as fodder for poultry and cattle. Leading exporters in 2010 were the United States, Australia and Argentina; Mexico was the largest importer of sorghum.
Rapeseed and corn crops were hardly used in 2014 to produce biofuels in Holland with reasons cited being the high price of corn and resistance to using food crops for fuel production. Rapeseed is used for well over 1% of the imported biofuels (biodiesel) while corn is used for 11% (bioethanol). Germany was the largest supplier of rape seed in 2014 (53%), followed by Romania (13%). For corn the largest supplier in 2014 was Ukraine (39%), followed by France (24%). Some maize fodder is fermented for biofuel production in Holland.
Punjab (the five rivers region) is one of the most fertile regions on earth. The region is ideal for growing wheat crop. Rice, sugar cane, fruits and vegetables are also grown. Indian Punjab is called the "Granary of India" or "India's bread-basket." Many records mistakenly mention that it produces 43% of India's wheat, but that is actually its contribution to the national pool. It produces 17% of India's wheat, and 11% of India's rice (2013 data). The total area of Punjab is just 1.4% of total area of India, but it produces roughly 12% of the cereals produced in the country. The largest grown crop is wheat. Other important crops are rice, cotton, sugarcane, pearl millet, maize, barley and fruits.
The principal crops of Punjab are barley, wheat, rice, maize and sugarcane. Among the fodder crops are bajra and jowar. In the category of fruits, it produces abundant stock of kinnow.
The main sources of irrigation are canals and tube wells.
The "rabi" or the spring harvest consists of wheat, gram, barley, potatoes and winter vegetables. The "Kharif" or the autumn harvest consists of rice, maize, sugarcane, cotton and pulses.
Agriculture sector is the largest contributor to the gross state domestic product (GSDP) of Punjab. According to 2013-14 data, the contribution of agriculture and allied industries in GSDP at factor cost is 28.13%.
Rajasthan is divided into 33 districts within seven divisions:
Rajasthan's economy is primarily agricultural and pastoral. Wheat and barley are cultivated over large areas, as are pulses, sugarcane, and oilseeds. Cotton and tobacco are the state's cash crops. Rajasthan is among the largest producers of edible oils in India and the second largest producer of oilseeds. Rajasthan is also the biggest wool-producing state in India and the main opium producer and consumer. There are mainly two crop seasons. The water for irrigation comes from wells and tanks. The Indira Gandhi Canal irrigates northwestern Rajasthan.
, India had a large and diverse agricultural sector, accounting, on average, for about 16% of GDP and 10% of export earnings. India's arable land area of 159.7 million hectares (394.6 million acres) is the second largest in the world, after the United States. Its gross irrigated crop area of 82.6 million hectares (215.6 million acres) is the largest in the world. India is among the top three global producers of many crops, including wheat, rice, pulses, cotton, peanuts, fruits and vegetables. Worldwide, , India had the largest herds of buffalo and cattle, is the largest producer of milk and has one of the largest and fastest growing poultry industries.
For thousands of years, humans have used selective breeding to improve production of crops and livestock to use them for food. In selective breeding, organisms with desirable characteristics are mated to produce offspring with the same characteristics. For example, this technique was used with corn to produce the largest and sweetest crops.
Shortly after the end of World War II, Trahan was the first farmer in the state of Louisiana to start producing crawfish in the same fields that he planted rice. This was done by rotating the crops. The rice was a summer crop, while the crawfish were a winter crop. According to biologist Percy Viosca, Jr., Trahan was given "full credit" for pioneering this method of producing a crawfish crop. This method of crawfish farming continues today and has grown into Louisiana's largest freshwater crustacean industry, with annual revenues that exceed US$300 million.
This upland area was settled by European Americans who wanted to develop cotton plantations to produce what became the largest commodity crop in the state. 
Mbeere district also came to be known with miraa, as it was the second largest producer after Meru. The miraa crop is commonly grown in what was the northern part of the district.
Guar is grown principally in north-western India and Pakistan with smaller crops grown in the semiarid areas of the high plains of Texas in the US, Australia and Africa. The most important growing area centres on Jodhpur in Rajasthan, India where demand for guar for fractionation produced an agricultural boom as in 2012. 
Currently, India and Pakistan are the main producers of cluster bean, accounting for 80% production of the world's total, while Thar, Punjab Dry Areas in Pakistan and Rajasthan, Gujarat, Kutch region occupies the largest area (82.1%) under guar cultivation in India. In addition to its cultivation in India and Pakistan, the crop is also grown as a cash crop in other parts of the world. Several commercial growers have converted their crops to guar production to support the increasing demand for guar and other organic crops in the United States.
GM cotton acreage in India grew at a rapid rate, increasing from 50,000 hectares in 2002 to 10.6 million hectares in 2011. The total cotton area in India was 12.1 million hectares in 2011, so GM cotton was grown on 88% of the cotton area. This made India the country with the largest area of GM cotton in the world.[58] A long-term study on the economic impacts of Bt cotton in India, published in the Journal PNAS in 2012, showed that Bt cotton has increased yields, profits, and living standards of smallholder farmers.[59] The U.S. GM cotton crop was 4.0 million hectares in 2011 the second largest area in the world, the Chinese GM cotton crop was third largest by area with 3.9 million hectares and Pakistan had the fourth largest GM cotton crop area of 2.6 million hectares in 2011.[58] The initial introduction of GM cotton proved to be a success in Australia– the yields were equivalent to the non-transgenic varieties and the crop used much less pesticide to produce (85% reduction).[60] The subsequent introduction of a second variety of GM cotton led to increases in GM cotton production until 95% of the Australian cotton crop was GM in 2009[61] making Australia the country with the fifth largest GM cotton crop in the world.[58] Other GM cotton growing countries in 2011 were Argentina, Myanmar, Burkina Faso, Brazil, Mexico, Colombia, South Africa and Costa Rica.[58]
Bihar lies in the river plains of the basin of the river Ganga. It is endowed with fertile alluvial soil with abundant water resources, especially ground water resources. This makes the agriculture of Bihar rich and diverse. Rice, wheat, and maize are the major cereal crops. Arhar, urad, moong, gram, pea, lentils, and khesaria are some of the pulses cultivated in Bihar. Bihar is the largest producer of vegetables, which is dominated by potato, onion, eggplant, and cauliflower. In fruit cultivation, it is the largest producer of lychee and the third largest producer of pineapple, as well as a major producer of mango, banana, and guava. Sugar cane and jute are two other major cash crops of Bihar.
China is the world's largest producer and consumer of agricultural products – and some 300 million Chinese farm workers are in the industry, mostly laboring on pieces of land about the size of U.S farms. Virtually all arable land is used for food crops. China is the world's largest producer of rice and is among the principal sources of wheat, corn (maize), tobacco, soybeans, potatoes, sorghum, peanuts, tea, millet, barley, oilseed, pork, and fish. Major non-food crops, including cotton, other fibers, and oilseeds, furnish China with a small proportion of its foreign trade revenue. Agricultural exports, such as vegetables and fruits, fish and shellfish, grain and meat products, are exported to Hong Kong. Yields are high because of intensive cultivation, for example, China's cropland area is only 75% of the U.S. total, but China still produces about 30% more crops and livestock than the United States. China hopes to further increase agricultural production through improved plant stocks, fertilizers, and technology.
Purba Bardhaman is an agriculturally prosperous district of West Bengal. The soil and climate of the district favour the production of food grains. The undivided Bardhaman district was the largest producer of rice in West Bengal, and bulk of it was produced in what is now Purba Bardhaman district. Rice, the major crop has three varieties – Aus (in autumn), Aman (in winter) and Boro (in summer). The yield rate of Boro was found higher comparable to that of Aus and Aman. Other than cereals and pulses, cash crops such as mustard, til, jute and potatoes are also grown.
North Dakota's earliest industries were fur trading and agriculture. Although less than 10% of the population is employed in the agricultural sector, it remains a major part of the state's economy. With industrial-scale farming, it ranks 9th in the nation in the value of crops and 18th in total value of agricultural products sold. Large farms generate the most crops. The share of people in the state employed in agriculture is comparatively high: , only approximately 2–3 percent of the population of the United States is directly employed in agriculture. North Dakota has about 90% of its land area in farms with of cropland, the third-largest amount in the nation. Between 2002 and 2007, total cropland increased by about one million acres (4,000  km); North Dakota was the only state showing an increase. Over the same period, were shifted into soybean and corn monoculture production, the largest such shift in the United States. Agriculturalists are concerned about too much monoculture, as it makes the economy at risk from insect or crop diseases affecting a major crop. In addition, this development has adversely affected habitats of wildlife and birds, and the balance of the ecosystem.
The state is the largest producer in the U.S. of many cereal grains, including barley (36% of U.S. crop), durum wheat (58%), hard red spring wheat (48%), oats (17%), and combined wheat of all types (15%). It is the second leading producer of buckwheat (20%). , corn became the state's largest crop produced, although it is only 2% of total U.S. production. The Corn Belt extends to North Dakota, but is more on the edge of the region instead of in its center. Corn yields are high in the southeast part of the state and smaller in other parts of the state. Most of the cereal grains are grown for livestock feed.
The state is the leading producer of many oilseeds, including 92% of the U.S. canola crop, 94% of flax seed, 53% of sunflower seeds, 18% of safflower seeds, and 62% of mustard seed. Canola is suited to the cold winters and it matures fast. Processing of canola for oil production produces canola meal as a by-product. The by-product is a high-protein animal feed.
Kazakhstan's largest crop is wheat, which it exports. It ranks as the sixth largest wheat producer in the world. Minor crops include barley, cotton, sugar beets, sunflowers, flax, and rice. Agricultural lands in Kazakhstan were depleted of their nutrients during the Virgin Lands Campaign during the Soviet era. This continues to affect production today. Kazakh wine is produced in the mountains east of Almaty.
Wheat and barley are cultivated in large areas, as are pulses, sugarcane, and oilseeds. Cotton and tobacco are cash crops. Rajasthan is among the largest producers of edible oils in India and the second largest producer of oilseeds. Rajasthan is also the biggest wool-producing state in India. There are mainly two crop seasons Kharif and Rabi. The main source of irrigation is wells and tanks. The Indira Gandhi Canal irrigates northwestern Rajasthan.
India is currently the world's second or third largest producer of several dry fruits, agriculture-based textile raw materials, roots and tuber crops, pulses, farmed fish, eggs, coconut, sugarcane and numerous vegetables. India ranked in the world's five largest producers of over 80% of agricultural produce items, including many cash crops such as coffee and cotton, in 2010. India is one of the world's five largest producers of livestock and poultry meat, with one of the fastest growth rates, .
The eastern part of the district is primarily agrarian in nature. Rice is the principal crop cultivated in the wet lands. The area under paddy cultivation in the district has been decreasing steadily over the past 3 decades. Ernakulam district is the largest producer of nutmeg and pineapple in the state. The area under nutmeg cultivation is showing an upward trend continuously. More than 70% of the total pineapple produced in the state is cultivated in the district. Pineapple is largely cultivated in Muvattupuzha and Vazhakulam. Rubber is the most cultivated plantation crop in the district and the district is the second largest producer of rubber in the state behind Kottayam. The other important crops cultivated in the district are Tapioca, Black pepper, Arecanut, Coconut, Turmeric, Banana and Plantain.
The most important crops are wheat, sugarcane, cotton, and rice, which together account for more than 75% of the value of total crop output. Pakistan's largest food crop is wheat. In 2017, Pakistan produced 26,674,000 tonnes of wheat, more than all of Africa and nearly as much as all of South America, according to the USDA. Pakistan has also cut the use of dangerous pesticides dramatically.
Ivory Coast (Côte d'Ivoire) leads the world in production and export of the cocoa beans used in the manufacture of chocolate, , supplying 33% of cocoa produced in the world. West Africa collectively supplies two thirds of the world's cocoa crop, with Ivory Coast leading production at 1.8 million tonnes , and nearby Ghana, Nigeria, Cameroon and Togo producing additional 1.55 million tonnes. Ivory Coast overtook Ghana as the world's leading producer of cocoa beans in 1978, and today is highly dependent on the crop, which accounts for 40% of national export income. The primary non-African competitor of Ivory Coast is Indonesia, which went from having almost nonexistent domestic cocoa industry in the 1970s to becoming one of the largest producers in the market by the early 2000s. According to the UN FAO, Indonesia overtook Ghana and became the second-largest producer worldwide in 2006. (World Cocoa Foundation provides significantly lower figures for Indonesia, but concurs that it is the largest producer of cocoa beans outside West Africa.) Large chocolate producers such as Cadbury, Hershey's, and Nestle buy Ivorian cocoa futures and options through Euronext whereby world prices are set.
The most essential staple food crops on the planet, like corn, wheat, rice, soybeans and sorghum, need no insect help at all; they are wind pollinated or self pollinating. Other staple food crops, like bananas and plantains, are sterile and propagated from cuttings, requiring no pollination of any form, ever. Further, foods such as root vegetables and salad crops will produce a useful food crop without pollination, though they may not set seed; and hybrids do not even require insect pollination to produce seeds for the next generation, because hybrid production is always human pollinated. Many of the most desirable and common non-hybrid crops, like heirloom tomatoes, are self pollinated, which is what makes their cultivar stable.