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我区是一个农业大区。近几年,随着“科技兴农”战略措施的实施和支农工业的崛起,号称“白色革命”的地膜覆盖栽培技术,经过十年的试验,示范、推广,年覆盖面积达150万亩,其中花生覆膜面积1992年达130万亩,占花生播种面积的70％左右,成为近几年花生增产的主要因素。但是,由于地膜是高分子化合物,在土壤中很难分解,拣拾不净易造成新的污染,破坏土壤物理性状,造成后茬作物减产。为摸清当前我区农田土壤中残膜数量,于1991～1992年对几个重点县进行土壤中残膜数量调查,现将结果报道如下:
My area is an agricultural area. In recent years, with the implementation of the strategic measures of “rejuvenating agriculture through science and technology” and the rise of supporting agriculture, the technology of film mulching cultivation known as the “White Revolution” has been tested and demonstrated for a decade with an annual area of 150 mu , Of which peanut covered area in 1992 reached 130 million mu, accounting for about 70% of peanut sown area, peanut production in recent years become a major factor. However, because the plastic film is a polymer compound, it is hard to be decomposed in the soil. If it is not picked up, it will easily cause new pollution, destroy the physical properties of the soil, and reduce the production of the following crops. In order to find out the current amount of residual film in farmland soil in our district, the number of residual film in the soil in several key counties from 1991 to 1992 was reported. The results are reported as follows: