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作物育种程序主要为天然杂交的数量所决定。在密西西比三角洲棉花天然杂交数量的测定研究中,在11个地点的有色素棉棉田内栽种了102穴无色素棉,其天然杂交率为0—6%,平均为2%。中部三角洲5个地点的天然杂交率则仅占0.2%。这些试验结果表明中部三角洲棉花基本上是一种自交作
Crop breeding programs are mainly based on the number of natural hybrids. In the determination of the number of natural cotton hybrids in the Mississippi Delta, 102 pigmented non-pigmented cottons were planted in pigmented cotton fields in 11 locations with a natural hybridization rate of 0-6% with an average of 2%. The natural hybridization rate in only 5 sites in the central delta accounted for only 0.2%. These test results show that the central delta cotton is basically a self-made