heh .. i let that slide .. guess no one knows for sure ..
CHINA
Vavilov thought that the mountainous regions of central and western China, together with the adjacent lowlands, constituted the earliest and largest independent centre of the world's agriculture. From earliest times, land use has been divided into two major regions by the Tsinling Mountains, with wheat predominant in the northern realm and rice in the south. At different periods and places, subsidiary crops have included soybean, kaoliang (a grain sorghum), millet, corn, barley, sweet potatoes, peanuts, fruits, and vegetables. Cotton, tobacco, sugarcane, tea, and sericulture (silkworms) have been the important cash crops.
Early history.
Archaeological information is comparatively scanty. It does not reveal when and how the first farmers settled down to cultivate food crops. Written records, available from about 1750 BC, are more conclusive. Tradition accords the honour of inventing agriculture to the legendary emperor Shen Nung, who is said to have carved a piece of wood into a plowshare and bent another piece to make a handle and taught the world the advantages of plowing and weeding. The chronicle Pai-hu t'ung relates that he did so out of necessity, because "the ancient people ate meat of animals and birds." At the time of Shen Nung, there were so many people that the wild animals and birds became inadequate for people's wants, and therefore Shen Nung taught the people to cultivate. As for the origin of cultivated plants, the problem was resolved by divinity: "Millet rained from heaven. Shen Nung collected the grains and cultivated them." Pigs are believed to have been domesticated in eastern Asia as early as 2900 BC.
Apparently the "millet from heaven" rained over the North China Plain in the central region of the Yellow River Valley, which is regarded as the birthplace of agriculture-based civilization in China. From there it spread throughout the country, but it failed to penetrate the northern grassland and plateaus. The Great Wall may be taken to demarcate the approximate frontier between the two basically different ways of life--the agrarian to the south and the pastoral nomadic of the steppes and deserts on the other side.
It is thought likely that the practice of irrigation spread to China from Babylonia. The Chinese are known to have had irrigation before 2200 BC. Notable Chinese irrigation works include the Tu-kiang Dam, built about 200 BC, which provided water for about 500,000 acres, and the Grand Canal, built in stages over several centuries and eventually extending for more than 1,000 miles.
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 and several regions of the Americas. .. more .. http://en.wikipedia.org/wiki/History_of_agriculture
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