由于甘薯繁殖倍数低、供种不足等原因,不少地区依靠调种甚至买苗进行甘薯生产,导致甘薯品种病、杂、退化,严重影响生产。据我们在北京市海淀区东升公社买来薯苗栽植的田间调查,其混杂率多在50%以上。从混杂的四个品种植株上分别截取秧头苗栽植成夏薯测试结果,选纯后的亩产5,700斤,比混杂的增产高达76%。 Due to the low multiplication of sweet potato, lack of supply and other reasons, many areas rely on or even buy seedlings to buy sweet potato production, resulting in sweet potato varieties disease, miscellaneous, degeneration, seriously affecting the production. According to our investigation in Haidian District, Dongsheng commune to buy potato seedlings planted in the field survey, the confounding rate of more than 50%. Seedlings were transplanted into summer sweet potato from the four hybrid plants, respectively. The average yield after selection was 5,700 kg, 76% more than the mixed production.