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一九八二年早季和晚季,我们分别在东平公社大面积杂交水稻丰产片和城关镇对不同杂优组合、不同常规品种及其不同的生育阶段,应用水稻叶鞘淀粉碘反应染色率作为安全施用穗粒肥的依据,取得很好的效果。通过多次的反复测试,我们认为用叶鞘淀粉碘反应染色率的比值作为安全施用穗粒肥的依据,具有做法简便,结果可靠等好处。 水稻光合作用所制造的碳水化合物,在穗分化前和穗分化初期,以淀粉的形式大部分贮存在叶鞘内。叶鞘内淀粉含量的多少,反映了稻株氮素营养水平的高低。叶鞘内淀粉含量多的,说明稻株氮素营养水平较低,反之则高,二者呈反相关。在决定施用穗粒肥和施多少肥方为较妥的时候,如果单凭肉眼察看叶色来决定施肥,往往会产生一些误差,甚至适得其反。
In the early and late seasons of 1982, we applied the iodine reaction staining rate of rice leaf sheath starch to different heterosis combinations, different conventional varieties and their different growth stages respectively in the large-yield hybrid rice high-yielding and high-yielding township in Dongping commune Safe application of grain fertilizer basis, and achieved good results. Through many repeated tests, we think that the ratio of iodine staining rate of leaf sheath starch used as the basis for the safe application of spike fertilizer has the advantages of simple method and reliable results. Carbohydrate produced by photosynthesis in rice is mostly stored in leaf sheaths in the form of starch before pre-panicle differentiation and early panicle differentiation. The amount of starch in the sheath, reflecting the nitrogen level of rice plants level. Starch content in the sheath more, indicating that rice plants nitrogen nutrition is low, and vice versa, the two were inversely correlated. When deciding whether to apply spike fertilizer or not and how much fertilizer should be used properly, it is often counterproductive to determine the fertilization by observing the leaf color by the naked eye.