晚春播对不同品种春棉产量及品质的影响

Efects of the Late Spring Sowing on Yield and Quality of Different Spring Cotton Varieties

以10个自育稳定棉花品系为试验材料,设置正常春播(4月26日)和晚春播(5月12日)两个播期,研究晚春播对不同春棉品种烂铃率以及产量和品质的影响。结果表明:播期和品种对皮棉产量有显著的互作效应,与正常春播相比,晚春播能显著降低伏前桃比例,提高伏桃比例,降低烂铃率;晚春播能显著降低衣分,对单铃重无显著影响;适期晚播能显著提高纤维断裂比强度、马克隆值和伸长率,显著降低纤维整齐度指数,而对纤维上半部平均长度无显著影响。

Taking 10 home- bred and stable cotton lines as experimental materials,we set two sowing dates（ normal spring sowing April 26 th and late spring sowing May 12th） to study the effect of late spring sowing on boll rot rate and yield and quality of different spring cotton varieties. The results showed that cultivars and sowing dates had a significant interaction effects on lint yield. In comparison with the normal spring sowing,late spring sowing could reduce the rate of bolls before July 15 and the lint percentage significantly,increase the rate of bolls between July 16 th to Auguest15 th,reduce boll rot rate,but it had no significant influence on boll weight. The suitable late sowing could significantly improve the breaking tenacity,micronaire value and elongation,significantly reduce the fiber uniformity index,but it had no significant effect on upper half mean fiber length.