前两篇我们已对杂交水稻在产量和各性状间都明显表现杂种优势作了叙述,并对主要经济性状间杂种优势的相关性作了分析。但国内外有的认为:水稻杂种优势是在非推广的稀植情况下,才表现真实的杂种优势,而在正常推广种植条件下的杂种优势程度却较低;也有的认为:势交水稻只有在高肥的栽培条件下,才有优势。 The first two articles We have described hybrid rice in the yield and traits are obvious between heterosis was described, and the major economic traits of heterosis correlation analysis. However, some people at home and abroad think that the hybrid heterosis of rice shows the true heterosis in the case of non-popularized rare planting, but the heterosis is lower under the normal popularization of planting. Some also think that the potential hybrid rice has only In high-fat cultivation conditions, have the advantage.