朝阳县棉花生产都采用地膜覆盖技术。但任何事物都有利有弊 ,随着连年采用地膜覆盖 ,耕地里的残膜量越积累越多。为了解确切情况 ,2 0 0 1年进行了专项调查 ,以便有针对性地提出相关措施。1调查结果调查时间于夏、秋季节进行。方法是对采用地膜覆盖的棉田进行挖测 ,先量取 1 m2 Cotton production in Chaoyang County uses mulching techniques. However, everything has advantages and disadvantages. With the continuous use of mulching, the more accumulated residual film in the cultivated land is. To understand the exact situation, a special survey was conducted in 2001 so as to propose pertinent measures in a targeted manner. 1 survey results The survey time in the summer and autumn seasons. Method is to dig the cotton field covered with plastic film, first measure 1 m2