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杂交水稻制种实践表明,利用父母本的叶龄差来确定母本播差期,是一种较易掌握,且准确度较高的方法。但高寒山区水稻有效生育期短,一般只能进行春播夏制,由于早春气温变化复杂,加以海拔高度变幅大,地区之间、年度之间的出叶速度有较大的差异。为了较好地利用叶龄差来确定父母本的播差期,1977年我们对应用叶龄差的有关问题,进行了初步观察研究,现将我们的初步体会介绍于下:
Hybrid rice seed production practice shows that the use of parents of the leaf age difference to determine the female sowing period, is a more easy to grasp, and a higher accuracy method. However, the effective growth period of paddy rice in the alpine region is short. Generally, it can only be sowed in spring. Because of the complex change of temperature in early spring and large amplitude change of altitude, there are great differences in the leafing speed between regions and years. In order to make better use of leaf age difference to determine the sowing date of parents, we conducted preliminary observations on the application of leaf age difference in 1977. Now we introduce our initial experience in the following: