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水稻幼穗第一苞分化期或第一次枝梗原基分化期,向土壤施速效氮肥、叶面喷施GA_35ppm加根外追肥(1％尿素)等,能明显地增加第二次枝梗和颖花数量,减少颖花和枝梗的退化,增加有效穗和每穗結实粒数,达到提高單位面积产量的目的。采用这几种控制措施所获得的增产效果与其所引起的生理效应相一致,它能促进植株在幼穗整个发育期的叶片含氮量增加,茎秆和叶鞘的淀粉和糖含量增加,植株各器官积累和分配光合产物C~(14)和P~(32)吸收量增多,尤以输送和分配到穗中部和穗下部的C~(14)和P~(32)的比例增加,幼穗呼吸强度增强,代謝旺盛,这些良好的生理性狀表現是揭发幼穗发育控制处理措施达到提高水稻單位面积产量的內部規律性的証据之一。本文还从采用幼穗发育控制所引起的这些良好的生理性狀效应出发,论定水稻生育中期施肥的必要性、可能性和当前生产上提供的可能条件。
In the first panicle differentiation stage or the first branch primordium differentiation stage, the rate of nitrogen fertilizer application to the soil, foliar application of GA 35ppm plus top-dressing (1% urea), etc., significantly increased the number of the second branch And the number of spikes to reduce the degradation of spikelets and stems, increase the effective panicle and grains per spike, to achieve the purpose of improving yield per unit area. The results obtained by using these control measures are consistent with the physiological effects caused by them. It can promote the increase of nitrogen content in leaves, the increase of starch and sugar content in stems and leaf sheaths, The uptake of photosynthate C ~ (14) and P ~ (32) increased with the increase of organs accumulation and distribution, especially the proportion of C ~ (14) and P ~ (32) Enhanced respiratory intensity and strong metabolism. These good physiological traits are one of the evidences to reveal the internal regularity that the control measures of panicle development can increase the yield per unit area of rice. Based on these good physiological traits induced by panicle development control, the paper also discussed the necessity and possibility of medium-term fertilization and the possible conditions of current production.