寒地半干旱地区覆膜玉米降解地膜筛选试验

Screening of Degradable Mulching Film on Maize in Cold Region and Semi Arid Area

为选择适宜降解地膜应用于寒地半干旱地区玉米生产,减少环境污染,采用大区对比方法,研究了不同降解地膜的降解时间对覆膜玉米产量的影响。结果表明：在覆膜后50～70d开始出现诱导期的降解膜不会减少覆膜玉米的产量,能够达到与常规地膜同样的保墒增温效果,而且降解后不会影响水份对玉米根系的直接补给,能够促进玉米产量的提高,减少残留地膜对耕地产生的环境污染。所以在寒地半干旱地区进行降解地膜栽培,降解速度较快,覆膜后50～70d开始出现诱导期裂纹的2、5号可降解地膜处理较为适宜。

For the selection of suitable degradable film applied to corn production in semiarid area and to reduce the environment pollution, the effects of different degradable mulch films with degradation time on the yield of maize were studied .The results showed that the film covering for 50-70d began to appear degradable, would not reduce maize yield and could be achieve the same soil warming effect with conventional film. And the degra-dation did not influence the moisture of maize root direct supply, but promoted the corn yield ,reduced the resid-ual film on farmland environmental pollution .So degradable mulching film cultivation in cold semiaridarea had fast degradation speed, No. 2 and No. 5 which began to appear cracks in induction period after filming for 50~70d were suitable .