不同生育阶段水分亏缺对水稻干物质与产量的影响

为探讨不同施氮条件下不同生育阶段水分亏缺对水稻生长的影响,通过盆栽试验研究了不同生育阶段水分调控后水稻生育后期干物质和产量的变化。结果表明:分蘖后期水分亏缺处理水稻产量较对照持平略有增加,水稻生长在亏缺复水后表现出明显的补偿效应;拔节孕穗后期和抽穗开花期水分亏缺处理干物质积累显著低于对照,并且抽穗开花期水分亏缺造成了水稻产量的显著下降;较高的氮素水平可以提高水分利用效率,减小水分亏缺给作物造成的危害,达到以肥补水、以水调肥的效果。

Effects of water deficit in different growing stages onyield and dry matter of rice

Impact of water deficit in different growing stages on rice growth was disscussed based on the change of dry matter and yield of rice under water regulation and different nitrogen levels from pot experiments.The results showed that the yield of rice was not significantly decreased and dry matter accumulation was slightly increased with water deficit during later tillering stage compared to check treatment,but rice is easy to be restrained from water deficit during jointing-booting and head-flowering stages,especially under water deficit during heading-flowering,the yield and dry matter accumulation were significantly decreased compared to check treatment.Nitrogen level would regulate crop growth under water deficit.High level of nitrogen can improve water use efficiency,release the damage to rice under water deficit,and realize the effect of water-fertilizer mutual coordinated.