转Bt基因抗虫棉品种(系)生育特点与种植效益比较研究

Comparative Study on Development and Planting Return among Various Genotypes of Bt Transgenic Cotton

对３类抗虫棉品种（系）生长发育和种植效益的比较研究结果表明，抗虫杂交棉６Ｈ１和Ｈ９５１３在生长发育上有明显的优势，常规抗虫棉美国３３Ｂ表现苗弱、前期生长慢、后发性强的特点。两个抗虫杂交棉品系的产量显著高于对照中棉所９４１８，两个常规抗虫棉的产量比对照低５％～２０％。抗虫棉品种（系）的总治虫用工可减少５７％，其中减少防治棉铃虫用工７０％；总治虫用药投入减少７０％，其中防治棉铃虫用药投入减少９０％。

The growth and development characteristics and planting return of various genotypes of Bt transgenic varieties were investigated in cotton field .The results showed that Bt transgenic hybrid cotton varieties 6H1 and H9513 were dominant in growth and development,and regular Bt transgenic cotton 33B grew slowly in its early stage and fast in late stage.In terms of yield,two hybrid varieties were significantly higher than Zhongmiansuo 9418(CK) ,while two regular Bt transgenic cottons were lower than the check by 5%20%.The total labor for pest control workdays could be decreased by 57% for planting Bt transgenic cotton varieties ,of which the bollworm controlling labor workdays was decreased by 70% compared with planting regular cotton varieties.The total pest controlling input was reduced by 70%,of which the bollworm controlling input was reduced by 90%.