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地膜覆盖是蔬菜生产中一项有效的增产措施,具有早熟、节水、省肥、高产等优点。以覆膜番茄为例,每亩纯收入可增加100元左右。增产的主要原因是覆膜后改变了土壤理化性状,与对照比较,覆膜后耕层土壤总孔隙度增加3—8%,地温提高3—4℃,水分增加2—5%。所有这些都为土壤微生物提供了良好的条件,进而加快了土壤有机质的矿化分解,提高了土壤的供肥能力。覆膜番茄必须施肥据试验,在覆膜区亩产番茄13,000斤左右,吸收氮36.6斤、磷19.9斤、钾55.4斤、钙44.6斤、镁15.3斤,分别比不覆膜的增加24.4%、31.5%,15.7%、31.7%、35.9%。虽覆膜当季养分供需基本是平衡
Mulch is a vegetable production in an effective stimulation measures, with precocious, water-saving, fertilizer, high yield and so on. To cover the tomato, for example, the net income per acre can increase about 100 yuan. The main reason for the increase is that the physical and chemical properties of soil changed after the coating. Compared with the control, the total porosity of the topsoil increased by 3-8%, the soil temperature increased by 3-4 ℃ and the water content increased by 2-5%. All of these provide good conditions for soil microorganisms, thereby accelerating the mineralization and decomposition of soil organic matter and improving soil fertility. Tomatoes must be fertilized According to the test, about 13,000 kg of mu are harvested in the mulching area, 36.6 kg of nitrogen is absorbed, 19.9 kg of phosphorus, 55.4 kg of potassium, 44.6 kg of calcium and 15.3 kg of magnesium are respectively increased by 24.4% 31.5%, 15.7%, 31.7%, 35.9%. Although the film nutrient supply and demand in the quarter is basically a balance