近年来由于地膜覆盖栽培技术在大田生产中的应用，尤其是玉米大双覆技术的推广，使我省粮食得到了大幅度提高。但因大双覆中的三垄变两垄栽培法把我省原有的垄作（６０～７０ｃｍ）变成了９０～１０５ｃｍ大垄，不适宜拖拉机和畜力进地作业，使农户在应用这项增产效果明显... In recent years, the application of plastic film mulching cultivation techniques in the field production, especially the popularization of large double-cover corn technology, has greatly improved the grain supply of our province. However, due to the big double cover in the three ridge two ridge cultivation method to the province’s original ridge (60 ~ 70cm) into a 90 ~ 105cm big ridge, not suitable for tractors and animal feed into the home, so that farmers in the application of this Significant increase in production ...