杂交水稻根系活力与产量密切相关。在生育前、中期,它具有明显的优势,但后期下降幅度大,根系容易早衰。生育后期伤流强度的下降幅度与物质生产呈负相关。因此,维持生育后期的根系活力对于提高杂交水稻产量有十分重要的意义。本文研究了始穗期叶面喷施氮、磷、钾对杂交水稻生育? Root vigor and yield of hybrid rice are closely related. In the pre-and mid-term, it has obvious advantages, but the decline in the late large, easy to premature aging. The rate of decline in wound intensity during late pregnancy was negatively correlated with material production. Therefore, to maintain the root activity of later stages of growth is of great importance to improve the yield of hybrid rice. This paper studied the beginning of the panicle foliar application of nitrogen, phosphorus and potassium on hybrid rice fertility?