杂交水稻直播栽培增产分析

The Theoretical Analysis on Increase in Yield of Hybrid Rice Growed Under Direct-seeding Cultivation

杂交水稻直播栽培增产分析表明,7个杂交水稻组合直播栽培与移栽方式有许多性状存在差异,单位面积有效穗数多、库源关系更加协调是水稻直播增产的主要原因,但其单株有效穗数少、分蘖成穗率偏低、个体发育优势弱是高产稳产的限制因素。两优885、411A/万测6-0、两优8153个杂交组合可作直播栽培进一步试种观察。

The experiment of hybrid rice cultivation under direct-seeding was conducted to analyze the effect of increasing yield. The results showed that seven typical rice varieties that grew under direct-seeding and transplantation had different characteristics. More efficetive panicle number per unit area and more harmonious sink-recource ralationship resulted in high-yield under direct-seeding,compared with transplantation. But it existed shorteness,such as few efficetive panicel numbers of single plant,low efficetive tiller percentage or weak advantage in individual development. Further studies were required to confirm Liangyou 885、411A/wance 6-0 and Liangyou 815 as the varieties of direct-seeding cultivation.