抽穗灌浆期持续强降水对双季早稻产量及生育期的影响

Effects of Continuous Heavy Rainfall at Heading～Filling Stage on Grain Yield and Growth Period of Double-cropping Early Rice

选取宜春市宜丰、樟树、上高三个试验点,通过与常年(2012~2016年)同期平均值对比,分析了宜春市2017年6月21日~7月2日持续强降水过程对早稻产量及生育期的影响。结果表明:早稻产量与抽穗灌浆期间的过程降水量呈极显著负相关;过程降水量对早稻产量的影响主要表现在结实率的显著下降上;抽穗灌浆期间的持续强降水显著延迟了早稻抽穗至成熟阶段的生育进程,使全生育期延长了4~8 d。

Yifeng,Zhangshu and Shanggao in Yichun city were selected as test points,and the effects of continuous heavy rainfall from June 21 st to July 2 nd,2017 in Yichun on the grain yield and growth period of double-cropping early rice were analyzed through the comparison with the average values in the corresponding period of 2012 - 2016. The results showed that there was a very significantly negative correlation between the early rice yield and the rainfall at heading - filling stage,and the yield reduction caused by the rainfall at heading - filling stage was mainly due to the significant decrease in the seed-setting rate. The continuous heavy rainfall at heading - filling stage significantly delayed the growth and developmental progress from heading to maturing of early rice,and extended its whole growth duration by 4 - 8 days.