晒田是水稻田间管理的重要措施之一,它对改善土壤环境条件,增进根系活力,控制氮素养分的吸收,促进碳水化合物的积累,进而对形成秆壮穗大,提高成穗率,结实率都有重要意义和作用。在生产实践中,农民往往根据水稻外部长势来确定晒田时间,不少长势差的禾苗已进入幼穗分化阶段才开始晒田,结果影响了产量的提高。为了摸清杂交晚稻晒田的最佳时期,笔者结合水稻苗情观察,利用水稻叶龄指数,找出杂交晚稻晒田的适期及临界期,现报告如下: Shanyian is one of the important measures for paddy field management. It can improve soil environmental conditions, enhance root activity, control the absorption of nitrogen nutrients, and promote the accumulation of carbohydrates, and thus promote the formation of stalks with strong spikes, Rate has important significance and role. In the practice of production, peasants often determine the drying time according to the external development of rice. Many long-growing grasses have entered the stage of young panicle differentiation and the result has affected the increase of production. In order to find out the best hybrid rice late Shanyi, the author combined with rice seedling observation, the use of rice leaf age index to find the appropriate and critical period of hybrid late rice Sha Tin, are as follows: