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对国产的 6种降解膜进行棉花覆盖栽培试验结果表明 ,采用降解膜覆盖栽培棉花较地膜覆盖栽培棉花的增产效应更显著。不同降解膜降解速度不同 ,南充 1、 2号、天津 1、 2号降解膜降解早且速度快 ,天津 3号、山西太源甲两种降解膜降解迟且速度慢 ,降解效果差。对照地膜降解度为 0 %。降解膜覆盖栽培棉花的果枝数 1 3～ 1 3.6个 ,单株结铃数 1 5～ 1 5.9个 ,分别比地膜覆盖栽培棉花多 0 .8～ 1 .4个和 0 .2～ 1 .1个。表明降解膜的保温增温效果优于地膜
The result of cotton covering experiment on six kinds of degradable membranes made in China shows that the yield-increasing effect of using degradable film to cover cultivated cotton is more significant than that of plastic film mulching. Different degradative membranes degraded at different rates. Nanhui No.1 and No.2, Tianjin No.1 and No.2 degraded membranes were degraded early and rapidly. The degraded membranes of Tianjin No.3 and Shanxi Taiyuan A degraded slowly and degraded poorly. The control film degradation was 0%. The number of fruit branches covered by degradable film covered cotton was 13 ~ 13.6, and the number of bolls per plant was 15 ~ 1 5.9, which were respectively 0.8 ~ 1.4 and 0.2 ~ 1.1 A It shows that the thermal insulation effect of degradation membrane is better than that of membrane