China is one of the world's largest producers and consumers of agricultural products.
Today Agriculture contributes for around 10% of China's GDP.
In the nineties we assist to a crises in the rural world.
The profitability of the grain cultivation decrease because the prices, state-controlled, increase less than the production costs.
Many farmers leave the grain cultivation for other activity and between 1979 and 2000 the sowned surface decrease of 12%.
To finance the social service and the infrastructure the government multiply the taxes, and the campaigns suffer insufficient investment: the poor regions miss the agricultural means and the rich regions the resources are invested in industrial activity.