膜下滴灌是将覆膜种植技术与滴灌技术相结合的新型灌溉技术,也是地膜栽培抗旱技术的延伸与深化。它根据作物生长发育的需要,将有压水源通过滴灌系统一滴一滴地向有限的土壤空间供给,仅在作物根系范围内进行局部灌溉,也可同时根据需要将化肥和农药等随水滴入作物根系。由于覆膜可大大减少作物的棵间蒸发,灌水时土壤表面几乎没 Drip irrigation under film is a new type of irrigation technology that combines the technology of film mulching with drip irrigation and the extension and deepening of drought-resistant mulching cultivation techniques. According to the needs of crop growth and development, there is a source of pressurized water dripped into the limited soil space through the drip irrigation system. Local irrigation can only be carried out within the crop root system. At the same time, fertilizers and pesticides can be dripped into crop roots . As the film can greatly reduce the evaporation of crops between the soil surface when irrigation is almost no