【摘要】 【目的】研究不同棉花品种对脱叶剂响应,筛选出脱叶效果较好棉花品种。【方法】选择脱叶效果较好的脱叶剂-脱吐隆,分析喷施前后棉花的光合作用和棉花叶片数、脱叶率、单株铃数、单铃重、单产、衣分、马克隆值、纤维长度等指标变化规律。【结果】Pn角度分析,喷施脱叶剂5 d敏感的品种顺序为P1、P3、P10、P8;Ci角度分析喷施脱叶剂5 d敏感的品种顺序为P1、P10、P2、P3;P10与P3在前期脱叶速率较快,后期P1脱叶速率较快,且脱叶率最高;产量性状各指标(P2衣分、皮棉除外)均低于清水对照;脱叶剂喷施与清水对照的纤维品质各指标差异均不显著(P>0.05)。【结论】P1、P3、P10品种对脱叶剂的响应较为迅速。更多还原

【Abstract】 【Objective】 This project aims to study the response of cotton varieties with different genotypes to defoliants in order to select cotton varieties with better defoliation effect. 【Method】Defoliation with better effect was selected to study the photosynthesis, the leaf number, defoliation rate, boll number per plant, boll weight per boll, yield per boll, lint percentage, micronaire value and fiber length of cotton before and after spraying. 【Result】From Pn point of view, the order of varieties sensitive to defoliant application for 5 days was P1, P3, P10 and P8; from Ci point of view, the order of varieties sensitive to defoliant application for 5 days was P1, P10, P2 and P3; the rate of defoliation of P10 and P3 was faster in the early stage, but the rate of defoliation of P1 was faster in the later stage, and the rate of defoliation was the highest; the indexes of yield traits(except for P2 lint and lint cotton) were lower than those of others. There was no significant difference in fiber quality between fresh water control and defoliant spraying(P > 0.05). 【Conclusion】Comparing photosynthesis and defoliation rate of the different cotton varieties, it was concluded that P1, P3 and P10 varieties responded quickly to defoliants.更多还原