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History of agriculture

Agriculture began independently in different parts of the globe, and included a diverse range of taxa. At least eleven separate regions of the Old and New World were involved as independent centers of origin. The development of agriculture about 12,000 years ago changed the way humans lived. They switched from nomadic hunter-gatherer lifestyles to permanent settlements and farming.

Origins
Origin hypotheses Scholars have developed a number of hypotheses to explain the historical origins of agriculture. Studies of the transition from hunter-gatherer to agricultural societies indicate an antecedent period of intensification and increasing sedentism; examples are the Natufian culture in the Levant and the Early Chinese Neolithic in China. Current models indicate that wild stands that had been harvested previously started to be planted, but were not immediately domesticated. Localised climate change is the favoured explanation for the origins of agriculture in the Levant. These conditions favoured annual plants which die off in the long dry season, leaving a dormant seed or tuber. An abundance of readily storable wild grains and pulses enabled hunter-gatherers in some areas to form the first settled villages at this time. Early development ian harvester's sickle, 3000 BC, made from baked clay Early people began altering communities of flora and fauna for their own benefit through means such as fire-stick farming and forest gardening very early. Wild grains have been collected and eaten from at least 105,000 years ago, and possibly much longer. Exact dates are hard to determine, as people collected and ate seeds before domesticating them, and plant characteristics may have changed during this period without human selection. An example is the semi-tough rachis and larger seeds of cereals from just after the Younger Dryas (about 9500 BC) in the early Holocene in the Levant region of the Fertile Crescent. Monophyletic characteristics were attained without any human intervention, implying that apparent domestication of the cereal rachis could have occurred quite naturally. pulled by two oxen. Similar ploughs were used throughout antiquity. Agriculture began independently in different parts of the globe and included a diverse range of taxa. At least 11 separate regions of the Old and New World were involved as independent centers of origin. Some of the earliest known domestications were of animals. Domestic pigs had multiple centres of origin in Eurasia, including Europe, East Asia and Southwest Asia, where wild boar were first domesticated about 10,500 years ago. Sheep were domesticated in Mesopotamia between 11,000 BC and 9000 BC. Cattle were domesticated from the wild aurochs in the areas of modern Turkey and India around 8500 BC. Camels were domesticated relatively late, perhaps around 3000 BC. identified by Nikolai Vavilov in the 1930s. Area 3 (grey) is no longer recognised as a centre of origin, and Papua New Guinea (red, 'P') was identified more recently. It was not until after 9500 BC that the eight so-called founder crops of agriculture appear: first emmer and einkorn wheat, then hulled barley, peas, lentils, bitter vetch, chick peas and flax. These eight crops occur more or less simultaneously on Pre-Pottery Neolithic B (PPNB) sites in the Levant, although wheat may have been the first to be grown and harvested on a significant scale. At around the same time (9400 BC), parthenocarpic fig trees were domesticated. Domesticated rye occurs in small quantities at some Neolithic sites in (Asia Minor) Turkey, such as the Pre-Pottery Neolithic B (c. 7600 – c. 6000 BC) Can Hasan III near Çatalhöyük, but is otherwise absent until the Bronze Age of central Europe, c. 1800–1500 BC. Claims of much earlier cultivation of rye, at the Epipalaeolithic site of Tell Abu Hureyra in the Euphrates valley of northern Syria, remain controversial. Critics point to inconsistencies in the radiocarbon dates, and identifications based solely on grain, rather than on chaff. By 8000 BC, farming was entrenched on the banks of the Nile. About this time, agriculture was developed independently in the Far East, probably in China, with rice rather than wheat as the primary crop. Maize was domesticated from the wild grass teosinte in southern Mexico by 6700 BC. The potato (8000 BC), tomato, pepper, squash, and some varieties of bean were domesticated in the New World. Agriculture was independently developed on the island of New Guinea. Bees were kept for honey in the Middle East around 7000 BC. Archaeological evidence from various sites on the Iberian peninsula suggest the domestication of plants and animals between 6000 and 4500 BC. The Céide Fields, located in Ireland consist of extensive tracts of land enclosed by stone walls, these walls date to 3500 BC and is the oldest known field systems in europe. The horse was domesticated in the Pontic steppe around 4000 BC In Siberia. Cannabis was in use in China in Neolithic times and may have been domesticated there; it was in use both as a fibre for ropemaking and as a medicine in Ancient Egypt by about 2350 BC. . The site was abandoned in the 19th century BC. |left In northern China, millet was domesticated by early Sino-Tibetan speakers at around 8000 to 6000 BC, becoming the main crop of the Yellow River basin by 5500 BC. across the Indo-Pacific In southern China, rice was domesticated in the Yangtze River basin at around 11,500 to 6200 BC, along with the development of wetland agriculture, by early Austronesian and Hmong-Mien-speakers. Other food plants were also harvested, including acorns, water chestnuts, and foxnuts. Rice cultivation was later spread to Maritime Southeast Asia by the Austronesian expansion, starting at around 3,500 to 2,000 BC. This migration event also saw the introduction of cultivated and domesticated food plants from Taiwan, Maritime Southeast Asia, and New Guinea into the Pacific Islands as canoe plants. Contact with Sri Lanka and Southern India by Austronesian sailors also led to an exchange of food plants which later became the origin of the valuable spice trade. In the 1st millennium AD, Austronesian sailors also settled Madagascar and the Comoros, bringing Southeast Asian and South Asian food plants with them to the East African coast, including bananas and rice. Rice was also spread southwards into Mainland Southeast Asia by around 2000 to 1500 BC by the migrations of the early Austroasiatic and Kra-Dai-speakers. and pearl millet by 2500 BC in Mali. In New Guinea, ancient Papuan peoples began practicing agriculture around 7000 BC, domesticating sugarcane and taro. Maize and squash were domesticated in Mesoamerica; potatoes in South America, and sunflowers in the Eastern Woodlands of North America. ==Civilizations==
Civilizations
Sumer ian cylinder seal, 2500 BC Sumerian farmers grew the cereals barley and wheat, starting to live in villages from about 8000 BC. Given the low rainfall of the region, agriculture relied on the Tigris and Euphrates rivers. Irrigation canals leading from the rivers permitted the growth of cereals in large enough quantities to support cities. The first ploughs appear in pictographs from Uruk around 3000 BC; seed-ploughs that funneled seed into the ploughed furrow appear on seals around 2300 BC. Vegetable crops included chickpeas, lentils, peas, beans, onions, garlic, lettuce, leeks and mustard. They grew fruits including dates, grapes, apples, melons, and figs. Alongside their farming, Sumerians also caught fish and hunted fowl and gazelle. The meat of sheep, goats, cows and poultry was eaten, mainly by the elite. Fish was preserved by drying, salting and smoking. Ancient Egypt , a grain store, harvesting with sickles, digging, tree-cutting and ploughing from Ancient Egypt. Tomb of Nakht, 15th century BC. The civilization of Ancient Egypt was indebted to the Nile River and its dependable seasonal flooding. The river's predictability and the fertile soil allowed the Egyptians to build an empire on the basis of great agricultural wealth. Egyptians were among the first peoples to practice agriculture on a large scale, starting in the pre-dynastic period from the end of the Paleolithic into the Neolithic, between around 10,000 BC and 4000 BC. This was made possible with the development of basin irrigation. Their staple food crops were grains such as wheat and barley, alongside industrial crops such as flax and papyrus. Indian Subcontinent Jujube was domesticated in the Indian subcontinent by 9000 BC. Barley and wheat cultivation – along with the domestication of cattle, primarily sheep and goats – followed in Mehrgarh culture by 8000–6000 BC. This period also saw the first domestication of the elephant. Cotton was cultivated by the 5th–4th millennium BC. By the 5th millennium BC, agricultural communities became widespread in Kashmir. Archeological evidence of an animal-drawn plough dates back to 2500 BC in the Indus Valley Civilization. Ancient China s in Yuanyang County, Yunnan Records from the Warring States, Qin dynasty, and Han dynasty provide a picture of early Chinese agriculture from the 5th century BC to 2nd century AD which included a nationwide granary system and widespread use of sericulture. An important early Chinese book on agriculture is the Qimin Yaoshu of AD 535, written by Jia Sixie. Jia's writing style was straightforward and lucid relative to the elaborate and allusive writing typical of the time. Jia's book was also very long, with over one hundred thousand written Chinese characters, and it quoted many other Chinese books that were written previously, but no longer survive. The work and the style in which it was written proved influential on later Chinese agronomists, such as Wang Zhen and his groundbreaking Nong Shu of 1313. (960–1127 AD) Chinese watermill for dehusking grain with a horizontal waterwheel For agricultural purposes, the Chinese had innovated the hydraulic-powered trip hammer by the 1st century BC. Although it found other purposes, its main function to pound, decorticate, and polish grain that otherwise would have been done manually. The Chinese also began using the square-pallet chain pump by the 1st century AD, powered by a waterwheel or oxen pulling an on a system of mechanical wheels. Although the chain pump found use in public works of providing water for urban and palatial pipe systems, it was used largely to lift water from a lower to higher elevation in filling irrigation canals and channels for farmland. By the end of the Han dynasty in the late 2nd century, heavy ploughs had been developed with iron ploughshares and mouldboards. These slowly spread west, revolutionizing farming in Northern Europe by the 10th century. (Thomas Glick, however, argues for a development of the Chinese plough as late as the 9th century, implying its spread east from similar designs known in Italy by the 7th century.) Asian rice was domesticated 13,500 to 8,200 years ago in China, with a single genetic origin from the wild rice Oryza rufipogon, Ancient Greece and Hellenistic world , symbol of wealth in the city of Metapontum in Magna Graecia (i.e. the Greek colonies of southern Italy), stamped stater, c. 530–510 BC The major cereal crops of the ancient Mediterranean region were wheat, emmer, and barley, while common vegetables included peas, beans, fava, and olives, dairy products came mostly from sheep and goats, and meat, which was consumed on rare occasion for most people, usually consisted of pork, beef, and lamb. Agriculture in ancient Greece was hindered by the topography of mainland Greece that only allowed for roughly 10% of the land to be cultivated properly, necessitating the specialised exportation of oil and wine and importation of grains from Thrace (centered in what is now Bulgaria) and the Greek colonies of Pontic Greeks near the Black Sea. During the Hellenistic period, the Ptolemaic Empire controlled Egypt, Cyprus, Phoenicia, and Cyrenaica, major grain-producing regions that mainland Greeks depended on for subsistence, while the Ptolemaic grain market also played a critical role in the rise of the Roman Republic. In the Seleucid Empire, Mesopotamia was a crucial area for the production of wheat, while nomadic animal husbandry was also practiced in other parts. Roman Empire harvesting machine, a vallus, from a Roman wall in Belgium, which was then part of the province of Gallia Belgica In the Greco-Roman world of Classical antiquity, Roman agriculture was built on techniques originally pioneered by the Sumerians, transmitted to them by subsequent cultures, with a specific emphasis on the cultivation of crops for trade and export. The Romans laid the groundwork for the manorial economic system, involving serfdom, which flourished in the Middle Ages. The farm sizes in Rome can be divided into three categories. Small farms were from 18 to 88 iugera (one iugerum is equal to about 0.65 acre). Medium-sized farms were from 80 to 500 iugera (singular iugerum). Large estates (called latifundia) were over 500 iugera. The Romans had four systems of farm management: direct work by the owner and his family; slaves doing work under the supervision of slave managers; tenant farming or sharecropping in which the owner and a tenant divide up a farm's produce; and situations in which a farm was leased to a tenant. The Americas Agricultural history took a different path from the Old World as the Americas lacked large-seeded, easily domesticated grains (such as wheat and barley) and large domestic animals that could be used for agricultural labor. Rather than the practice which developed in the Old World of sowing a field with a single crop, pre-historic American agriculture usually consisted of cultivating many crops close to each other utilizing only hand labor. Moreover, agricultural areas in the Americas lacked the uniformity of the east–west area of Mediterranean and semi-arid climates in southern Europe and southwestern Asia, but instead had a north–south pattern with a variety of different climatic zones in close proximity to each other. This fostered the domestication of many different plants. At the time of first contact between the Europeans and the Americans, the Europeans practiced "extensive agriculture, based on the plough and draught animals," with tenants under landlords, but also forced labor or slavery, while the Indigenous peoples of the Americas practiced "intensive agriculture, based on human labour." Europeans wanted control of land for the grazing of their livestock and property rights for the control of production. Though they were impressed with the productivity of traditional farming techniques, they saw no connection to their system and were dismissive of Native American practices as "gardening" rather than a commercializable enterprise. Due to several thousand years of selective breeding, maize, the hemisphere's most important crop, was more productive than Old World grain crops. Maize produced two and one-half times more calories per acre than wheat and barley. South America . using a human-powered foot plough The earliest known areas of possible agriculture in the Americas dating to about 9000 BC are in Colombia, near present-day Pereira, and by the Las Vegas culture in Ecuador on the Santa Elena peninsula. The plants cultivated (or manipulated by humans) were lerén (Calathea allouia), arrowroot (Maranta arundinacea), squash (Cucurbita species), and bottle gourd (Lagenaria siceraria). All are plants of humid climates and their existence at this time on the semi-arid Santa Elena peninsula may be evidence that they were transplanted there from more humid environments. In another study, this area of South America was identified as one of the four oldest places of origin for agriculture, along with the Fertile Crescent, China, and Mesoamerica, dated between 6200 BC and 10000 BC. Coca, still a major crop to this day, was domesticated in the Andes, as were the peanut, tomato, tobacco, and pineapple. Animals were also domesticated, including llamas, alpacas, and guinea pigs. The people of the Inca Empire of South America grew large surpluses of food which they stored in buildings called Qullqas. The most important crop domesticated in the Amazon Basin and tropical lowlands was probably cassava (Manihot esculenta), which was domesticated before 7000 BCE, likely in the Rondônia and Mato Grosso states of Brazil. The Guaitecas Archipelago in modern Chile was the southern limit of Pre-Hispanic agriculture near 44° South latitude, as noted by the mention of the cultivation of Chiloé potatoes by a Spanish expedition in 1557. Mesoamerica (top), maize-teosinte hybrid (middle), to maize (bottom) In Mesoamerica, wild teosinte was transformed through human selection into the ancestor of modern maize, about 7,000 BC. It gradually spread across North America and to South America and was the most important crop of Native Americans at the time of European exploration. Other Mesoamerican crops include hundreds of varieties of locally domesticated squash and beans, while cocoa, also domesticated in the region, was a major crop. The turkey, one of the most important poultry birds, was probably domesticated in Mexico or the U.S. Southwest. In Mesoamerica, the Aztecs were active farmers and had an agriculturally focused economy. The land around Lake Texcoco was fertile, but not large enough to produce the amount of food needed for the population of their expanding empire. The Aztecs developed irrigation systems, formed terraced hillsides, fertilized their soil, and developed chinampas or artificial islands, also known as "floating gardens". The Mayas between 400 BC to 900 AD used extensive canal and raised field systems to farm swampland on the Yucatán Peninsula. North America village of grass houses surrounded by maize fields in the United States The indigenous people of the Eastern U.S. domesticated numerous crops. Sunflowers, tobacco, varieties of squash and Chenopodium, as well as crops no longer grown, including marsh elder and little barley. Wild foods including wild rice and maple sugar were harvested. The domesticated strawberry is a hybrid of a Chilean and a North American species, developed by breeding in Europe and North America. Two major crops, pecans and Concord grapes, were used extensively in prehistoric times but do not appear to have been domesticated until the 19th century. The indigenous people in what is now California and the Pacific Northwest practiced various forms of forest gardening and fire-stick farming in the forests, grasslands, mixed woodlands, and wetlands, ensuring that desired food and medicine plants continued to be available. The natives controlled fire on a regional scale to create a low-intensity fire ecology which prevented larger, catastrophic fires and sustained a low-density agriculture in loose rotation; a sort of "wild" permaculture. A system of companion planting called the Three Sisters was developed in North America. Three crops that complemented each other were planted together: winter squash, maize (corn), and climbing beans (typically tepary beans or common beans). The maize provides a structure for the beans to climb, eliminating the need for poles. The beans provide the nitrogen to the soil that the other plants use, and the squash spreads along the ground, blocking the sunlight, helping prevent the establishment of weeds. The squash leaves also act as a "living mulch". Sub-Saharan Africa . Thomas E. Bowdich – 1817 In the Sahel region, civilizations such as the Mali and Songhai empires cultivated sorghum and pearl millet, which were domesticated between 3000 and 2500 BC. Archaeological evidence suggests that Sanga cattle may have been independently domesticated in East Africa at around 1600 BC. In the tropical region of West Africa, crops such as black-eyed peas, Sea Island red peas, yams, kola nuts, Jollof rice and kokoro were domesticated between 3000 and 1000 BC. The guineafowl is a poultry bird that was domesticated in West Africa, and while the time of the guineafowl's domestication remains unclear, there is evidence that it was present in Ancient Greece during the 5th century BC. Several species of coffee were also domesticated throughout Sub-Saharan Africa, with Coffea arabica originating in Ethiopia and serving as the main production of modern-day coffee since the late 15th century. Oceania Australia '', was planted and harvested by Indigenous Australians in eastern central Australia. Indigenous Australians were predominately nomadic hunter-gatherers. Due to the policy of terra nullius, Aboriginals were regarded as not having been capable of sustained agriculture. However, the current consensus is that various agricultural methods were employed by the indigenous people. In the 1970s and 1980s archaeological research in south west Victoria established that the Gunditjmara and other groups had developed sophisticated eel farming and fish trapping systems over a period of nearly 5,000 years. The archaeologist Harry Lourandos suggested in the 1980s that there was evidence of 'intensification' in progress across Australia, a process that appeared to have continued through the preceding 5,000 years. These concepts led the historian Bill Gammage to argue that in effect the whole continent was a managed landscape. ==Middle Ages and Early Modern period==
Middle Ages and Early Modern period
Europe The Middle Ages saw further improvements in agriculture. Monasteries spread throughout Europe and became important centers for the collection of knowledge related to agriculture and forestry. The manorial system allowed large landowners to control their land and its laborers, in the form of peasants or serfs. During the medieval period, the Arab world was critical in the exchange of crops and technology between the European, Asia and African continents. Besides transporting numerous crops, they introduced the concept of summer irrigation to Europe and developed the beginnings of the plantation system of sugarcane growing through the use of slaves for intensive cultivation. By AD 900, developments in iron smelting allowed for increased production in Europe, leading to developments in the production of agricultural implements such as ploughs, hand tools and horse shoes. The carruca heavy plough improved on the earlier scratch plough, with the adoption of the Chinese mouldboard plough to turn over the heavy, wet soils of northern Europe. This led to the clearing of northern European forests and an increase in agricultural production, which in turn led to an increase in population. At the same time, some farmers in Europe moved from a two field crop rotation to a three-field crop rotation in which one field of three was left fallow every year. This resulted in increased productivity and nutrition, as the change in rotations permitted nitrogen-fixing legumes such as peas, lentils and beans. Improved horse harnesses and the whippletree further improved cultivation. Watermills were introduced by the Romans, but were improved throughout the Middle Ages, along with windmills, and used to grind grains into flour, to cut wood and to process flax and wool. Crops included wheat, rye, barley and oats. Peas, beans, and vetches became common from the 13th century onward as a fodder crop for animals and also for their nitrogen-fixation fertilizing properties. Crop yields peaked in the 13th century, and stayed more or less steady until the 18th century. Though the limitations of medieval farming were once thought to have provided a ceiling for the population growth in the Middle Ages, recent studies have shown that the technology of medieval agriculture was always sufficient for the needs of the people under normal circumstances, and that it was only during exceptionally harsh times, such as the terrible weather of 1315–17, that the needs of the population could not be met. Arab world wheels to lift water for irrigation and household use were among the technologies introduced to Europe via Al-Andalus in the medieval Islamic world. From the 8th century to the 14th century, the Islamic world underwent a transformation in agricultural practice, described by the historian Andrew Watson as the Arab agricultural revolution. Columbian exchange After 1492, a global exchange of previously local crops and livestock breeds occurred. Maize, potatoes, sweet potatoes and manioc were the key crops that spread from the New World to the Old, while varieties of wheat, barley, rice and turnips traveled from the Old World to the New. There had been few livestock species in the New World, with horses, cattle, sheep and goats being completely unknown before their arrival with Old World settlers. Crops moving in both directions across the Atlantic Ocean caused population growth around the world and a lasting effect on many cultures in the Early Modern period. ''. Pieter Bruegel – 1565 Maize and cassava were introduced from Brazil into Africa by Portuguese traders in the 16th century, becoming staple foods, replacing native African crops. After its introduction from South America to Spain in the late 1500s, the potato became a staple crop throughout Europe by the late 1700s. The potato allowed farmers to produce more food, and initially added variety to the European diet. The increased supply of food reduced disease, increased births and reduced mortality, causing a population boom throughout the British Empire, the US and Europe. The introduction of the potato also brought about the first intensive use of fertilizer, in the form of guano imported to Europe from Peru, and the first artificial pesticide, in the form of an arsenic compound used to fight Colorado potato beetles. Before the adoption of the potato as a major crop, the dependence on grain had caused repetitive regional and national famines when the crops failed, including 17 major famines in England between 1523 and 1623. The resulting dependence on the potato however caused the European Potato Failure, a disastrous crop failure from disease that resulted in widespread famine and the death of over one million people in Ireland alone. ==Modern agriculture==
Modern agriculture
British agricultural revolution introduced four-field crop rotation and the cultivation of turnips. Between the 17th century and the mid-19th century, Britain saw a large increase in agricultural productivity and net output. New agricultural practices like enclosure, mechanization, four-field crop rotation to maintain soil nutrients, and selective breeding enabled an unprecedented population growth to 5.7 million in 1750, freeing up a significant percentage of the workforce, and thereby helped drive the Industrial Revolution. The productivity of wheat went up from per acre in 1720 to around by 1840, marking a major turning point in history. 's seed drill, invented in 1701 Advice on more productive techniques for farming began to appear in England in the mid-17th century, from writers such as Samuel Hartlib, Walter Blith and others. The main problem in sustaining agriculture in one place for a long time was the depletion of nutrients, most importantly nitrogen levels, in the soil. To allow the soil to regenerate, productive land was often let fallow and, in some places, crop rotation was used. The Dutch four-field rotation system was popularised by the British agriculturist Charles Townshend in the 18th century. The system (wheat, turnips, barley and clover) opened up a fodder crop and grazing crop allowing livestock to be bred year-round. The use of clover was especially important as the legume roots replenished soil nitrates. The mechanisation and rationalisation of agriculture was another important factor. Robert Bakewell and Thomas Coke introduced selective breeding and initiated a process of inbreeding to maximise desirable traits from the mid 18th century, such as the New Leicester sheep. Machines were invented to improve the efficiency of various agricultural operation, such as Jethro Tull's seed drill of 1701 that mechanised seeding at the correct depth and spacing and Andrew Meikle's threshing machine of 1784. Ploughs were steadily improved, from Joseph Foljambe's Rotherham iron plough in 1730 to James Small's improved "Scots Plough" metal in 1763. In 1789 Ransomes, Sims & Jefferies was producing 86 plough models for different soils. Powered farm machinery began with Richard Trevithick's stationary steam engine, used to drive a threshing machine, in 1812. Mechanisation spread to additional farm uses throughout the 19th century. The first petrol-driven tractor was built in America by John Froelich in 1892. John Bennet Lawes began the scientific investigation of fertilization at the Rothamsted Experimental Station in 1843. He investigated the impact of inorganic and organic fertilizers on crop yield and founded one of the first artificial fertilizer manufacturing factories in 1842. Fertilizer, in the shape of sodium nitrate deposits in Chile, was imported to Britain by John Thomas North as well as guano (birds droppings). The first commercial process for fertilizer production was the obtaining of phosphate from the dissolution of coprolites in sulphuric acid. 20th century ploughing an alfalfa field Dan Albone constructed the first commercially successful gasoline-powered general-purpose tractor in 1901, and the 1923 International Harvester Farmall tractor marked a major point in the replacement of draft animals (particularly horses) with machines. Since that time, self-propelled mechanical harvesters (combines), planters, transplanters and other equipment have been developed, further revolutionizing agriculture. These inventions allowed farming tasks to be done with a speed and on a scale previously impossible, leading modern farms to output much greater volumes of high-quality produce per land unit. in genetically modified peanut leaves (bottom) protect from damage by corn borers (top). The Haber-Bosch method for synthesizing ammonium nitrate represented a major breakthrough and allowed crop yields to overcome previous constraints. It was first patented by German chemist Fritz Haber. In 1910 Carl Bosch, while working for German chemical company BASF, successfully commercialized the process and secured further patents. In the years after World War II, the use of synthetic fertilizer increased rapidly, in sync with the increasing world population. Collective farming was widely practiced in the Soviet Union, the Eastern Bloc countries, China, and Vietnam, starting in the 1930s in the Soviet Union; one result was the Soviet famine of 1932–33. Another consequence occurred during the Great Leap Forward in China initiated by Mao Tse-tung that resulted in the Great Chinese Famine from 1959 to 1961 and ultimately reshaped the thinking of Deng Xiaoping. In the past century agriculture has been characterized by increased productivity, the substitution of synthetic fertilizers and pesticides for labour, water pollution, and farm subsidies. Other applications of scientific research since 1950 in agriculture include gene manipulation, hydroponics, and the development of economically viable biofuels such as ethanol. The number of people involved in farming in industrial countries fell radically from 24 percent of the American population to 1.5 percent in 2002. The number of farms also decreased, and their ownership became more concentrated; for example, between 1967 and 2002, one million pig farms in America consolidated into 114,000, with 80 percent of the production on factory farms. According to the Worldwatch Institute, 74 percent of the world's poultry, 43 percent of beef, and 68 percent of eggs are produced this way. Famines however continued to sweep the globe through the 20th century. Through the effects of climatic events, government policy, war and crop failure, millions of people died in each of at least ten famines between the 1920s and the 1990s. Green Revolution , father of the Green Revolution of the 1970s, is credited with saving over a billion people worldwide from starvation. The Green Revolution was a series of research, development, and technology transfer initiatives between the 1940s and the late 1970s. It increased agriculture production around the world, especially from the late 1960s. The initiatives, led by Norman Borlaug and credited with saving over a billion people from starvation, involved the development of high-yielding varieties of cereal grains, expansion of irrigation infrastructure, modernization of management techniques, distribution of hybridized seeds, synthetic fertilizers, and pesticides to farmers. Synthetic nitrogen, mined rock phosphate, pesticides, and mechanization have greatly increased crop yields in the early 20th century. Increased supply of grains has also led to cheaper livestock. Further, global yield increases were experienced later in the 20th century when high-yield varieties of common staple grains such as rice, wheat, and corn were introduced as a part of the Green Revolution. The Green Revolution exported the technologies (including pesticides and synthetic nitrogen) of the developed world to the developing world. Thomas Malthus famously predicted that the Earth would not be able to support its growing population. Still, technologies such as the Green Revolution have allowed the world to produce a food surplus. Although the Green Revolution significantly increased rice yields in Asia, yield leveled off. The genetic "yield potential" has increased for wheat, but the yield potential for rice has not increased since 1966, and the yield potential for maize has "barely increased in 35 years". It takes only a decade or two for herbicide-resistant weeds to emerge, and insects become resistant to insecticides within about a decade, delayed somewhat by crop rotation. , 1972 Organic agriculture For most of its history, agriculture has been organic, without synthetic fertilisers or pesticides, and without GMOs. With the advent of chemical agriculture, Rudolf Steiner called for farming without synthetic pesticides, and his Agriculture Course of 1924 laid the foundation for biodynamic agriculture. Lord Northbourne developed these ideas and presented his manifesto of organic farming in 1940. This became a worldwide movement, and organic farming is now practiced in many countries. ==See also==
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