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利用2间玻璃室内夜间不同的温度条件,研究了水稻生长期间夜温升高对双季早、晚稻物质生产和养分积累的影响。结果表明:播种-幼穗分化期夜温升高增加早稻的干物质积累,而减少晚稻的干物质积累;幼穗分化期-抽穗的夜温升高对早、晚稻的干物质积累均有一定的负作用;抽穗后的夜温升高对早稻物质生产影响较小,但降低其茎鞘物质的转运,而晚稻的干物质生产和茎鞘物质的转运均提高。在早稻幼穗分化前夜温适度升高有利于提高根系活力,促进植株养分的积累,但不利于晚稻植株养分的积累;幼穗分化-抽穗期间的夜温升高均不利于早、晚稻植株的养分积累;灌浆结实期的夜温升高会造成早稻根系早衰,不利于养分吸收,但有利于保持晚稻根系较高活力,促进养分吸收。试验证明,不同生育阶段的夜温升高对双季水稻不同生育阶段的干物质生产和养分吸收的影响是不同的。
The effects of night-time night temperature during rice growth on the material production and nutrient accumulation in early and late rice varieties were studied by using different nighttime temperatures in two glasshouses. The results showed that the increase of night temperature during sowing-panicle differentiation increased the dry matter accumulation of early rice and decreased the dry matter accumulation of late rice. The panicle initiation-heading night temperature had a certain effect on the accumulation of dry matter of early and late rice . The night-temperature rise after heading had less effect on the material production of early rice, but decreased the translocation of stem and sheath substances, while the dry matter production and the translocation of stem and sheath substances increased in late rice. In the early rice panicle differentiation on the eve of early warm temperature increase is conducive to improving root activity and promote the accumulation of plant nutrients, but not conducive to the accumulation of late rice plant nutrients; young panicle differentiation - heading during the night temperature are not conducive to early and late rice plants Nutrient accumulation; grain-filling period of the night temperature will cause premature rice root decline, is not conducive to nutrient absorption, but is conducive to maintaining a higher vitality of late rice root, and promote nutrient absorption. The experiment proves that the effect of night-temperature rise at different stages of growth on dry matter production and nutrient uptake in different growth stages of double cropping rice is different.