摘要
通过在棉花不同生长发育时期叶面喷施不同浓度BN 2调节剂 ,其结果 :棉花现蕾期和开花期喷施有显著的增产效果 ,在 2～ 4mg/kg浓度下 ,增产皮棉 2 7.5～ 2 94 .0kg/hm2 ,增产效果显著 ;在适宜时期和浓度下叶面喷施BN 2 ,可在一定程度上提高棉花品质 ;跨长比CK增加 0 .1～ 0 .8mm ,纤维强度比CK增加 0 .3～ 1.5cN/tex ,伸长率变化不大 ,马克隆值降低 ,纤维整齐度明显提高 ,棉花纤维手感明显改善 .BN 2适宜使用时期为现蕾期到开花期 ,使用浓度为 2～ 4mg/kg .
The significant effect of BN 2 regulator with different intensities on increasing ginned yield at different stages was studied. The ginned cotton can be increased by 27.5～294.0 kg/hm 2 at squaring stage and florescence and by using BN 2 with intensity of 2～4 mg/kg. The cotton quality can be raised by leaf spraying of BN 2 at appropriate stages. Fiber length and intensity can be increased by 0.1～0.8mm and 0.3 ～1.5 cN/tex as compared with CK. Micronaire tends to decrease, fiber uniformity was significantly heightened, cotton softness was obviously improved by leaf spraying of BN 2 regulator at suitable stages. The suitable period and consistency for using BN 2 are squaring and florescence stages and with its intensity 2～4mg/kg.
