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地膜除了现在通常使用的无色透明膜外,还有多种性能各异的专用膜。随着地膜覆盖栽培技术的发展,这些在农业生产上有特殊功能的地膜需求量逐渐增加,现选择其中主要的几种介绍如下。一、有色膜在聚乙烯树脂中加入色母料,可制成各种不同颜色的有色膜。由于不同的有色膜对光谱的吸收及反射规律不同,对杂草、病虫害、作物生长、地膜变化等可产生特殊的影响。如黑色膜覆盖后,可见光透射率在10％
Mulch In addition to the now commonly used colorless and transparent film, there are a variety of different performance of the special film. With the development of plastic film mulching cultivation techniques, the demand of these plastic mulches with special functions in agricultural production is gradually increasing. Several main types of the mulching film are selected as follows. First, the colored film in the polyethylene resin masterbatch can be made into a variety of different colors of colored film. Due to different color film absorption and reflection of different spectrum of law, weeds, pests and diseases, crop growth, film changes can have a special impact. Such as black film coverage, the visible light transmittance of 10%