目前生产中进行的玉米自交系原种繁殖,就是在自交系原种圃中严格选典型优株,人工套袋自交或姊妹株混粉杂交繁殖,选株数量较多,一般约一百至数百株。长期以来,人工套袋采用雌雄异袋法,即将当选植株的雌穗和雄穗分别套在两个袋子中,授粉必须取下袋子操作,这种办法费工、费时,且种子纯度不高,因在盛花期,全田植株雄穗花粉四处飘散,取袋授粉时雌穗易沾染部分外界花粉,造成混杂。近年来,我们在实践中摸索出了一个简便、实用的套袋方法——雌雄穗同袋授粉法,其步骤如下:1.准备套袋用具:(1)宽20厘米、长33厘米两头 At present, the production of maize inbred lines of the original species breeding, that is, in the original inbred lines of the original selection of strictly selected typical strains of plants, self-bagging or self-artificial sown hybrid cross breeding, the number of selected strains are generally about one Hundreds to hundreds. For a long time, the artificial bagging method using the dioecious method, about to be elected plant ear and tassel were set in two bags, pollination must remove the bag operation, this method is laborious, time-consuming, and the purity of the seeds is not high, due to In the full flowering period, the whole field of plant tassel pollen floating around, take the bag pollination, the ear is easy to contaminate part of the external pollen, causing mixed. In recent years, we have worked out a simple and practical bagging method in practice - male and female spike bag with the same method of pollination, the steps are as follows: 1. Prepare bagging utensils: (1) 20 cm wide and 33 cm long