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棉花是常异花授粉作物,其种子繁殖系数比其他作物都低,一般只有5～10倍,而采用高倍繁殖技术繁殖系数可达20～30倍,繁殖抗虫棉种则能较快增加种子的数量,不仅能够尽量满足生产需求,而且还能够加快抗虫棉良种推广的步伐。 1 选地整地应选择地势平坦、土壤肥力均匀、排灌方便的壤土或沙壤土种植,要施足底肥,深耕并精细整地,一般基施优质土杂肥4000～4500kg/667m~2,磷酸二铵30～
Cotton is an evergreen pollination crop, whose seed propagation coefficient is lower than that of other crops, generally 5 to 10 times, while the multiplication coefficient of high multiplication technique can reach 20 to 30 times, while the breeding insect-resistant cotton species can increase the seed rapidly Not only to meet the production needs as much as possible, but also to speed up the promotion of insect-resistant cotton varieties. 1 The selection of land preparation should be flat topography, uniform soil fertility, irrigation and drainage of convenient loam or sandy loam planting, to apply enough fat, deep plowing and fine preparation of soil, generally based on the quality of miscellaneous fertilizer 4000 ~ 4500kg / 667m ~ 2, diammonium phosphate 30 ~