近日 ,中国农业大学研制的绿地牌残膜回收机顺利试制完成 ,有望在２０００年前完善制造工艺 ,使产品批量生产。资料显示 ,地膜覆盖技术可大幅度提高作物单产 ,目前在蔬菜、玉米等农作物中大量使用 ,现每年已达到４００万公顷。然而地膜在田间停留时间较长 ,易破碎 ,如今主要依 Recently, China Agricultural University developed green brand film recycling machine successfully completed pilot trial, is expected to improve the manufacturing process by 2000, the product mass production. Data show that plastic film mulching technology can significantly increase crop yields. Currently, it is widely used in crops such as vegetables and corn, and now it has reached 4 million hectares annually. However, the film stays longer in the field, easy to break, now mainly by