Agriculture involving domestication of plants and animals was developed around 10,000 B.C.E. although earlier people began altering communities of flora and fauna for their own benefit through other means such as fire-stick farming prior to that. Agriculture has undergone significant developments since the time of the earliest cultivation. The Fertile Crescent of Western Asia, Egypt and Indiawere 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 yieldsto 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, andmechanization. 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. In recent years, there has been a backlash against theexternal environmental effects of mechanized agriculture, and increasing support for theorganic movement and sustainable agriculture.




http://en.m.wikipedia.org/wiki/History_of_agriculture

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