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在水稻花粉母细胞减数分裂之前即幼穗分化处于四期末至五期初施肥,能保证减数分裂期有充足的营养供应,以防止枝梗及颖花退化,增加结实率,故称为保花肥。水稻剑叶露尖前两天至剑叶刚露尖即幼穗分化刚好处在四期末至五期初时为保花肥的最适宜施用时期,这在理论上和实践上都是可行的。但怎样才能知道水稻剑叶即将露尖或刚露尖呢?笔者从事水稻苗情观察记载工作多年,通过对大量水稻品种的详细观察记载和大量剥检稻株幼穗发育情况,发现水稻剑叶即将露尖或刚露尖时(剑叶露尖是指水稻剑叶露出倒2叶叶
In rice pollen mother cell meiosis before that spike differentiation in the late four to early fertilization, to ensure adequate supply of nutrients during meiosis to prevent the degeneration of branches and spikes, and increase the seed setting rate, so called Paul Fertilizer. It is theoretically and practically feasible that the spikelet differentiation of rice leaf tip two days before to the blade of the blade of leaves is just the optimum period of application of fertilizer to protect the young spike just at the end of the fourth and fifth phases. But how to know the rice leaf is about to expose or just bare tip? I was engaged in rice seedling observations and records for many years, through a large number of rice varieties observed and recorded a large number of pestle dissection of young panicle development, rice flag leaf Will soon tip or just bare tip (the tip of the flag leaves refers to the rice leaves out of 2 inverted leaves