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棉花不同种和品种杂交的后代表现明显的杂种优势,增产作用可延续几代。但棉花品种内杂交增产幅度不大,一般为5—10%。棉花种间杂交(陆地棉与海岛棉)虽然表现生长优势强,产量高于海岛棉,但低于陆地棉,纤维品质也存在一些问题。由于二代分离严重等原因,只能利用一代,直接用于生产困难很大。目前推广的是陆地棉品种间杂交棉花优势的利用。1974年河南农林科学院测定,中棉所7号与华棉7号杂交一代,亩
The offspring hybrids of different varieties and varieties of cotton show obvious heterosis, prolonging the production by several generations. However, the yield increase within the hybrid cotton varieties is not large, usually 5-10%. Cotton interspecific hybridization (Upland cotton and sea-island cotton) showed superior growth and higher yields than sea-island cotton, but there were some problems with the quality of cotton below that of Upland cotton. Due to the serious separation of the second generation and other reasons, only a generation can be used directly for the production of a great difficulty. The promotion of cotton is the advantage of the use of cotton cross between varieties of upland cotton. Henan Academy of Agriculture and Forestry in 1974 determination, China Cotton 7 and Hua Cotton 7 hybrid generation, mu