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采用加性－显性遗传模型，分析了１２个陆地棉亲本及其１７个Ｆ１组合两年不同铃期及不同铃位成铃数的杂种优势．结果表明：除７月２６日和８月３１日两期外，其余各铃期成铃数平均优势均极显著，其中立秋前成铃优势不断增强，立秋后成铃优势逐渐下降，尤以８月１３日至８月１９日下降明显，从１９．６％减至９．５％．各铃位成铃数中，只有上部铃位１和中部铃位１的成铃平均优势达显著水平．
Addition - dominance genetic models were used to analyze the heterosis of twelve landline cotton parents and their 17 F1 combinations for two years of bolls at different bolls and bolls. The results showed that except for July 26 and August 31, the average number of bolls in other periods was extremely significant. Among them, the advantages of bolls before the beginning of autumn increased continuously, and the advantages of bolls gradually decreased after the fall of autumn, especially in 8 From January 13 to August 19, the decline obviously dropped from 19.6% to 9.5%. Among the number of bells per ringing, only the average superiority of ringing of the upper bells 1 and the middle bells 1 reaches a significant level.