在杂交水稻制种中,虽然有了准确的播差期做保证,但由于受气候变化、秧苗素质、秧龄长短、肥水管理等多因子的影响,常会出现花期不遇或不能全遇,从而影响制种产量的提高。因此,如何及时地、有效地采用各种调节花期措施,促父母本花期相遇或全遇,是夺取制种高产的关键。通常可采用以下几种调花措施: 1.氮控钾促调节法。一般来说,偏施氮肥有推迟始穗,偏施钾肥有提早始穗的作用。利用这一特 In hybrid rice seed production, although accurate sowing date is guaranteed, due to climate change, the quality of seedlings, the age of seedling, the management of fertilizer and water and other factors, inflorescences often fail or can not be fully met, thus affecting the system Seed production increased. Therefore, how to timely and effectively adopt various measures to regulate flowering periods and encourage parents to encounter flowering periods is the key to seizing high yields. The following methods can usually be used to adjust flowers: 1. Nitrogen-controlled potassium regulators. In general, partial nitrogen fertilizer delayed initial panicle, potassium partial potassium has the role of early initiation of ear. Use this special