“国以农为本,农以种为先”。在我国耕地面积越来越少的现实面前,农业基础条件的改善和良种的推广应用,将担负起实现粮食安全目标的重任。1997～2006年天津市小麦主要种植的品种为京冬8号,通过10年种植,京冬8号品种已经混杂,种性退化,尤其一些农户采 “Country to agriculture-based, farming to species first ”. In the face of less and less cultivated land in our country, the improvement of basic agricultural conditions and the promotion and application of improved varieties will assume the important task of achieving the goal of food security. The main cultivated varieties of wheat in Tianjin from 1997 to 2006 were Jingdong 8. After 10 years of planting, the varieties of Jingdong 8 have been mixed and their species degenerated, especially for some farmers