杂交水稻不育系的好坏,直接关系到杂交稻制种的田间纯度高低,关系到大田杂交种子优势的强弱,是杂交稻种子质量的基础和关键。因此,必须认真搞好隔离,及时去杂去劣,抢晴科学收割,严防机械混杂,全部精选加工,提高田间纯度,主要应抓好以下五关。 1.选择隔离关。一般繁殖田隔离区要求200米以内无早稻和早熟中稻品种;也可选择河流、村庄、旱作、林带、山冲等自然屏障隔离。如要采取时间隔离,要求花期错开25天以 The quality of the hybrid rice CMS is directly related to the purity of the hybrid rice seed in the field, which is related to the strength of hybrid seeds in the field. It is the basis and key of hybrid rice seed quality. Therefore, we must conscientiously do a good job in isolation, in time to miscellaneous and bad, grab sunny science harvest, prevent mechanical mixing, all the selected processing, improve the purity of the field, the main five should pay close attention to the following. 1. Select the isolation switch. The general breeding field quarantine requirements within 200 meters without early rice and early maturing varieties of rice; also choose rivers, villages, dry farming, forest belt, mountain and other natural barrier isolation. To take time to isolate the flowering requires staggering 25 days