近年来,本市地膜覆盖栽培有较大发展,1981年达到2000亩。覆盖品种有10多种,主要是春季早熟栽培蔬菜,其中春土豆面积约占40％。覆盖材料大部分是国产的无色透明膜,厚0.015毫米。据调查,采用地膜覆盖栽培的土豆、茄果和瓜豆类蔬菜,都获得了早熟、高产。其中以土豆增产效果最明显,川沙县一般每亩增产50％左右,上海县、嘉定县每亩增产80％左右,而且土豆的大薯百分率增加50％左右,高的达一倍多。蕃茄、甜椒、茄子增产约40％,刀豆、豇豆增产约30％,黄瓜较差,一般增产10～30％。覆盖栽培的成熟期一般提早7天左右,春土豆能 In recent years, the city mulching cultivation has greater development, reaching 2,000 acres in 1981. Covering more than 10 species, mainly in early spring cultivation of vegetables, spring potatoes which account for about 40% of the area. Covering most of the material is made of colorless, transparent film, 0.015 mm thick. According to the survey, potatoes, eggplant and melon and bean vegetables that are mulched and covered with plastic film have all achieved early maturity and high yield. Among them, the most obvious effect was potato yield increase. Chuansha County generally increased production by about 50% per mu, and the yield per mu in Shanghai and Jiading County increased by about 80%. Moreover, the potato’s potato percentage increased by 50% and its height more than doubled. Tomato, sweet pepper, eggplant yield about 40%, beans, cowpea yield about 30%, cucumber is poor, the general increase of 10 to 30%. Covering the cultivation of maturity generally about 7 days earlier, spring potatoes can