不同可降解地膜对棉花生理及产量的影响

【目的】可降解地膜是治理棉田残膜污染的有效途径,探讨可降解地膜对棉花生长及产量的影响。【方法】通过不同可降解地膜和普通PE地膜的比较,研究其对棉花生理、植株性状及产量的影响。【结果】最大叶面积指数(LAImax)和全生育期群体光合势的大小顺序一致,依次为:BXS90BJS90HYS50CK,LAI3.5,BXS90和BJS90为21 d,HYS50为14 d,CK为7 d。4种地膜的棉花干物质积累均可用Logistic曲线表示,成熟时积累量BJS90、BXS90、HYS50、CK分别为1 099.201、329.351、085.08和1 019.49 g/m2,产量依次为:5 537.13、5644.155、060.58和4 855.83 kg/hm2。【结论】可降解地膜LAImax和群体光合势较高,具有较长的LAI3.5持续时间,决定了其具有较高的干物质积累量和产量。

Effects of Different Degradable Plastic Film on Yeild and Physiology of Cotton

【Objective】 Degradable plastic film is effective way to control residual plastic film pollution.This study explored application effect of degradable plastic film on cotton.【Method】The experiment studied effects of degradable plastic film on physiology,plant characters and yeild of cotton by three kinds of degradable plastic film by comparison with CK(normal film).【Result】The results showed that the trend of LAImax and population leaf area duration in whole growth period were the same:the order was as follows:BXS90>BJS90>HYS50>CK,BXS90 and BJS90 LAI>3.5,lasted 21 d,HYS50 had 14d,CK had 7 d.The dry matter accumulation of four kinds of film can use Logistic curve to be expressed.Accumulation of dry matter of BJS90,BXS90,HYS50,CK reached 1 099.20,1 329.35,1 085.08,1019.49 g/m2 repectively,when cotton maturation,and yield were: 5 537.13,5 644.15,5 060.58,4 855.83 kg/hm2 repectively.【Conclusion】The results showed that cotton mulching degradalbe film had higher LAImax and population leaf area duration,Longer LAI>3.5 last time determined higher dry matter and yield.