【摘要】 自１９８４年以来，对国内外３０种不同型号的可控制降解时间的光降解地膜，进行了棉花田间效应研究认为，光解膜在自然曝晒下在一定时间范围内能够自行降解，与普通地膜相比具有相同的土壤环境效应和相近的增产效果。降解产物对土壤的矿质元素含量无明显影响，也未发现有害物质产生。在棉田应用时，诱导期控制在６０天左右，此后，降解过程越短越好，最长不宜超过１２０天。更多还原

【Abstract】 Since l984,30 different types of photdegradable plastic films under the controlleddegrading time were studied to find out the effect on the cotton fields。It was considered thatthe photodegradable plastic film could be resolved under the sunlight within certain time com-pared with common plastic film,Result showed that it has the same soil enviromment effectand similar increase yield effect to the control.There was no obvious influence to the mineralelements and no harmful effect.Applied in the cotton fields,the inductive duration should becontrolled within 60 days。There after,the shorter the better of the degrading processes,butthe longest time shouldn’t be over l20 days。更多还原