【摘要】 对当今我国广泛应用的覆盖种植技术──秸秆覆盖免耕和薄膜覆盖栽培研究表明，在这两种耕作栽培措施下每年可节水２０～４０ｍｍ。节水数量虽然不大，但苗期的土壤水保持着较高能量水平，为提高产量打下良好基础，而从水利用效率角度分析，实际节水每年可达６０～２００ｍｍ，效益更为显著。更多还原

【Abstract】 The research on straw mulching by no-tillage and on film mulching declared that 20￣40mm water was saved Per year.This was a small quantity,but the soil water potential at the early stage of plant growth was kept higher, and this provided a good condition for high yield. From viewpoint of water using efficiency,the water quantity saved reached 60￣200mm.更多还原