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以25个杂交中稻组合为材料,通过促芽肥施用时期与剪穗、剪叶处理,研究了促芽肥施用时期对不同源库类型杂交中稻再生力的影响。结果表明,杂交中稻组合间的再生力存在显著差异;施促芽肥无论早施还是迟施都会显著提高再生稻产量,而且早施比迟施的增产效果好,每穗着粒数越高的组合增产效果越好。其原因在于,头季稻杂交组合间每穗着粒数与齐穗期的叶粒比和茎粒比均呈极显著负相关,以致头季稻每穗着粒数越多,其满足头季稻高产后剩余的光合产物量越少,头季稻齐穗后15d再生芽的死亡也越多,施促芽肥补充营养的时期就应更早。每穗着粒数超过163粒的中、大穗型组合,促芽肥以头季稻齐穗期施用为佳;每穗着粒数少于163粒的小穗型组合,头季稻齐穗期至齐穗后15d均可以施促芽肥。
Using 25 hybrid mid-rice combinations as materials, the effect of promoting germination period on the reproductive ability of middle-aged hybrid rice with different source and sink types was studied through the periods of promoting germination, cutting ear and cutting leaf. The results showed that there was a significant difference in the reproductive ability among the middle-hybrid rice combinations. Whether the early or late application of the fertilized bud fertilizer could significantly increase the yield of ratooning rice, Combination of the better the effect of increasing production. The reason for this is that there is a significant negative correlation between the grain number per ear and the ratio of stem to grain in the first crop of hybrid rice so that the more grains per ear in the first crop, The less the amount of photosynthate remained after high-yielding rice, the more dead shoots regenerated from the 15th day after heading, and the period of promoting the nutrition of budding fertilizer should be earlier. Spike grain number of more than 163 per panicle, large panicle combinations, promote buds to use the first crop of heading season rice is better; spike grain number less than 163 spikelet combinations, the first crop of full heading rice Spraying buds can be applied 15 days after heading.