为探明自花授粉作物—水稻有无杂种优势,杂种优势的程度、表现、与栽培条件的相关性,以及生产上如何利用杂种优势,同时进行主要经济性状构成产量优势的遗传机理分析。其主要研究结论如下: 1.采用六种统计方法对水稻杂种优势分析表明:杂交水稻普遍具有优势,平均竞争优势为35.52±20.05;平均超亲优势为32.58±29.42;平均杂种优势为53.13±32.92。 In order to find out whether the self-pollinated rice-hybrid rice has heterosis, the degree and performance of heterosis, the relationship with the cultivation conditions and how to use the heterosis in the production, the genetic mechanism analysis that the main economic traits constitute the yield superiority is analyzed. The main conclusions of the study are as follows: 1. The analysis of heterosis of rice by six statistical methods showed that the hybrid rice generally had the advantage, the average competitive advantage was 35.52 ± 20.05, the average super-parents was 32.58 ± 29.42 and the average heterosis was 53.13 ± 32.92 .