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一、引言目前生产上推广的南优和汕优系统的杂交水稻,其父本生育期比母本长达30—50天之久。在制种上为了达到父、母本同时开花,提高制种产量的目的,必须在播种前预测父、母本的花期,以具体确定父、母本的播种差期。研究表明,用有效积温方法预报杂交水稻亲本花期一般比用叶龄法和生育期天数法较为可靠。但是,由于有效积温数值
I. INTRODUCTION At present, the hybrid rice grown on the Nanyou and Shanyou systems has a growth period of 30-50 days longer than that of its parent. In order to achieve the purpose of seed multiplication at the same time for the parent and the female parents to increase their seed production, the flowering period of the parent and the female must be predicted before sowing to determine the sowing difference between the parent and the female. Studies have shown that using the effective accumulated temperature method to forecast the flowering of hybrid rice parents is generally more reliable than the leaf age method and days of growth period method. However, due to the effective accumulated temperature value