光解地膜棉田效应研究

The Effect of Photodegradable Film in Cotton Field

１９８４年以来，对国内外２９种不同型号可控制降解时间的光降解地膜，进行了棉花田间效应的研究，认为光解膜在自然曝晒下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。在降解末期土壤表层有机质测值明显提高，土壤容重有减轻趋势。但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，降解过程在１２０天以内，有较好的实用价值。

Since 1984, 29 different types of photodegradable plastic-films that the resolving time could by controled were studied to find out the effect in the cotton fields. It was considered that the photodegradable plastic film could be resolved in the sun in certain time. Compared with common plastic film it has the same soil enviromment effect and similar increase yield effect. At the later resolving stage, Organic matter content in the soil surface detected was significantly increased and the soil capacity trended to be decreased but the mineral element content in the soil was not obviously influenced and no heaviful matters were formed. Applied in the cotton fields the inductive duration should be controled with 60 days, the resolving process should be within 120 days, in this way the photodegradable plastic film can exert its practical value.