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一、净效积温及其求算近几年来,我们在杂交稻的制种试验中,进行了花期稳定相遇的研究。曾在大量的亲本中,用播始历期间的资料,将当前广泛使用的生育期法、叶龄法,积温法(有用活动积温、有效积温、净效积温)进行筛选,其结果为:净效积温最稳定,变异度小于4％,其次是叶龄,变异度在5％左右,而生育期、活动积温、有效积温其变异度均在10％以上。从几年的生产实践证明,在高温地区或
First, the net effect of temperature and its calculation In recent years, we in hybrid rice seed production trials, conducted a stable encounter florescence. In a large number of parents, using the information during the preimplantation period, the current widely used methods of growth period, leaf age, accumulated temperature (useful activity accumulated temperature, effective accumulated temperature, net effect accumulated temperature) were screened. The results are as follows: net The effective temperature is the most stable, the variation is less than 4%, followed by the leaf age, the variation is about 5%, while the variation of growth, active accumulated temperature and effective accumulated temperature are above 10%. From years of production practice has proved that in high temperature areas or