每年深秋,初冬季节,北方蔬菜多采用冬暖式或拱棚栽培。为了提高地温,减少棚内土壤水分蒸发,降低保护地内的空气湿度,减少栽培蔬菜的病害发生,采用“地膜将地面全覆盖”的方法。其实这种做法是不科学的。一、地膜全覆盖后影响土壤的气体交换。大家知道,土壤与大自然是一个有机整体,如果把地面全用地膜覆盖,将使土壤通气状况恶化,不利于根系吸收水分和矿物质。土壤通 Autumn every autumn, early winter, the northern vegetables and more use of winter or Shed cultivation. In order to increase the ground temperature, reduce evaporation of soil moisture in the shed, reduce the humidity of the air in the protected area and reduce the occurrence of diseases of cultivated vegetables, the method of “covering the ground with the plastic film” is adopted. In fact, this approach is unscientific. First, the full coverage of mulch affect the soil gas exchange. We all know that the soil and nature are organic. If the ground is completely covered with plastic film, the soil aeration will deteriorate and the root system will not absorb water and minerals. Soil pass