地膜覆盖栽培(以下简称覆膜)对改善蔬菜的生态环境和土壤养分的供应状况能起到很好的作用也给蔬菜施肥提出了新的课题。为此,我们于1982—1983年以番茄为试材,对与当地生产关系密切和在土壤中活性较大的氮素进行研究。现将初步结果整理如下。 Film mulching (hereinafter referred to as film) to improve the ecological environment of vegetables and soil nutrient supply can play a very good role in the fertilization of vegetables also put forward a new topic. To this end, we used tomato as test material in 1982-1983 and studied nitrogen that is closely related to local production and more active in soil. The preliminary results are now organized as follows.