由于大棚多年连作种植,造成病菌、虫卵积聚。另外,由于保护地施肥种类单一、过量,造成土壤盐分上升,盐害加重。因此,大棚菜地的土壤改良尤为重要。菜田地的土壤条件菜田地应选择土层厚度在50～70厘米,有机质含量2.5%～3.5%,全氮含量 As the greenhouse for many years even for planting, resulting in germs, eggs accumulation. In addition, due to the single and excessive fertilization types in the protected area, the salt content of the soil increased and salt damage worsened. Therefore, the soil improvement of greenhouse vegetable is particularly important. Soil conditions in vegetable fields Vegetable fields should be selected to have a thickness of 50-70 cm, organic matter 2.5% -3.5%, total nitrogen