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农用地膜种类很多,由于其厚度、颜色、性能之不同,所起的作用也不同,使用时应根据作物、栽培目的、效益的高低而选用合适的农膜。 1、春季用地膜覆盖作物,其主要目的是提高地温,促进作物生长发育,应选用透明膜。因此膜透光率高,提高地温也较高。 2、用于花生栽培的地膜,应选用光解塑料膜。此膜见光易碎,利于花生果针入土,提高地温。 3、日光温室及瓜菜用的棚膜,宜选用无滴膜。因膜没有水滴或少有含水滴,透光率高,既可提高棚内温度,还能增强作物的光合作用,提高地温。 4、杂草较严重的地块,为消除杂草,最好选用黑色地膜。在高温季节栽培低温作物,如夏萝卜,白菜,菠菜等,为降低土壤温度,防止因高温而生长发育不良,也可选用黑色膜或黑白双层膜。 5、在容易发生蚜虫和病毒的地块,应选用银黑色双重膜,这种膜有驱避蚜虫,防病毒病的作用。 6、在易发生杂草的田间,如水稻、花生、韭菜、
Many types of agricultural film, because of its thickness, color, performance, the role played by different, use should be based on crops, cultivation purposes, the effectiveness of the appropriate selection of agricultural plastic sheeting. 1, Spring mulching crops, its main purpose is to improve ground temperature and promote crop growth and development, should use a transparent film. Therefore, high transmittance film, increased ground temperature is also higher. 2, for the cultivation of peanut film, photolytic plastic film should be used. This film see the light fragile, conducive peanut fruit pin into the soil, improve ground temperature. 3, sunlight greenhouse and melon vegetables with film, should use no drip film. Because the film has no water droplets or few water droplets, high transmittance, can increase the greenhouse temperature, but also enhance crop photosynthesis and improve ground temperature. 4, weeds more serious plots, in order to eliminate weeds, the best selection of black plastic film. In the hot season cultivation of low temperature crops, such as summer radish, cabbage, spinach, etc., in order to reduce soil temperature, prevent growth due to high temperature and poor growth, but also the choice of black film or black and white bilayer. 5, prone to aphids and viruses plots, silver black double membrane should be used, this film has to repel aphids, anti-virus disease. 6, prone to weeds in the fields, such as rice, peanuts, leeks,