水稻产量由每亩穗数、每穗粒数和粒重三者的乘积构成。这三个产量构成因素之间存在着辩证关系,三者组成的产量结构随品种、自然条件和栽培条件的变化而异。由于每亩穗数的变幅一般要比每穗粒数和粒重的变幅大,因而每亩穗数就成为三者中最活跃的因素,对产量构成起着主要作用。实践证明:这个构成产量的关键因素——每亩穗数虽然受多方面条件的影响,但在一般生产条件下,每亩穗数的多少在很大程度上取决于基本苗数。特别是二季晚稻,基本苗数的影响就更为突出。因此,摸清基本苗对产量结构的影响及其和产量构成因 The rice yield consists of the product of the number of spike per acre, grain number per spike and grain weight. There is a dialectical relationship between the three yield components. The yield structure of the three components varies with varieties, natural conditions and cultivation conditions. Since the amplitude of the panicle per acre is generally larger than that of the panicles per panicle and the grain weight, the panicle per acre becomes the most active of the three and plays a major role in the yield composition. Practice has proved that the key factor that constitutes a yield - although the number of acres per acre affected by many conditions, but under normal conditions of production, the number of spikes per acre largely depends on the number of basic seedlings. Especially the second season late rice, the impact of the basic number of seedlings even more prominent. Therefore, to find out the impact of basic seedlings on the yield structure and its yield components