The significance of the development of China's ancient agriculture to the present?

China's ancient agriculture in the long-term development of cultivation and accumulation of a large number of crop varieties resources. As early as in the book in the Warring States, "Guanzi - ground staff" chapter, there have been various types of crop varieties and their suitable soil records, the Jin Dynasty, "Guangzhi" and the Northern Wei Dynasty, "Qimin Essentials" on crop varieties of the account, regardless of the number and traits have been a great development. By the Qing Dynasty, only the official large-scale agricultural book "authorized time Tongkao" included in some provinces, cities and counties of rice varieties that amounted to more than 3,000. Rich, distinctive varieties of resources, not only to meet the various needs of human production and life, but also the basis of breeding work, today and tomorrow, agriculture, has an inestimable significance.