杂交水稻亲本播始历期与实效积温的相关性研究

Study on the Correlation between Duration from Seeding to Heading and Effective Accumulative Temperatures of Hybrid Rice Parents

水稻的各生长发育阶段都需要相对稳定的有效积温,通过对40个杂交水稻亲本播期试验结果的分析,确认26℃以下的有效积温(即实效积温)与杂交水稻亲本的播始历期密切相关,而大于26℃的积温是无效的,不能缩短播始历期。实效积温在推测播始历期、调整后播亲本播种期以及花期预测等方面具有一定的实际指导意义。

Every growing stage of rice needs relatively stable value of effective accumulative temperatures. By analyzing the results of the experiment on 40 parents of hybrid rice in the fields on their different sowing days, it was concluded that the effective accumulative temperatures below 26℃ were closely correlated to the days from seeding to heading of hybrid rice parents, accumulative temperatures above 26℃ were ineffective, and days from seeding to heading were unable to be curtailed. The conclusions gave the guidance for presuming duration from seeding to heading, adjusting the sawing date of later sowing parents and forecasting the florescence.