据资料介绍 ,我国南方双季晚粳仍以常规稻为主。随着化学除草剂的广泛应用和早稻机械化收割率的提高 ,使晚粳种子繁殖面临着草相的变化 ,同时面临着生物学混杂 (主要是籼粳交 )比例提高的影响 ,使得去杂工作成为新的难题。根据对繁殖田块的观察 ,在南方双季稻区 ,早稻属较易落 According to the information, southern China double season late japonica rice is still dominated by conventional rice. With the extensive application of chemical herbicides and the increase of mechanization yield of early rice, the seed multiplication of late japonica rice is confronted with the change of grass phase and the influence of the increase of the proportion of biological hybrids (mainly indica and japonica hybrids) Become a new problem. According to the observations on the breeding plots, in the southern double cropping area, the early genus Rupi is easy to fall