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为了在水稻高产栽培中合理施用氮肥,近年国内各地介绍应用淀粉——碘试法测定水稻叶鞘的淀粉反应,从而制定水稻氮素营养水平的分级标准,为合理使用氮肥提供参考依据.此法只适用于水稻幼穗分化以后的生育期,但我们于1975年晚造开始至1977年多次试用此法,初步观察到使用此法也可应用于水稻幼穗分化以前的生育期,现将一些体会,简介于下:
In order to apply nitrogenous fertilizer rationally in high-yielding rice cultivation, starch-iodine test was applied to determine the starch response of rice sheath in recent years to establish the grading standard of nitrogenous nutrient level in rice so as to provide reference for rational use of nitrogen fertilizer. It is suitable for the growth stage after panicle differentiation of rice. However, we tried this method several times in the late evening of 1975 to 1977. It was initially observed that this method can also be applied to the pre-panicle stage of rice panicle differentiation. Experience, brief introduction on the next: