在塑料大棚或温室栽培中，肥料不易随水流失。除一部分肥料被作物吸收外，剩余肥料基本全部残留在土壤中，磷肥被土壤吸附，硝酸钙、氯化钾、硫酸钾等积聚土壤表层，浓度过高，对作物造成危害。同时，棚、室内温度较高，随水分蒸发将盐分带至地表，损伤作物根系和妨碍根对养分 In plastic greenhouse or greenhouse cultivation, fertilizer is not easy with water loss. Except for a part of fertilizer being absorbed by crops, most of the remaining fertilizers remain in the soil. Phosphate fertilizer is adsorbed by the soil. Calcium nitrate, potassium chloride and potassium sulfate accumulate on the surface of the soil and the concentration is too high, which will endanger the crop. At the same time, shed, indoor temperature is high, with the evaporation of salt to the surface, damage crop roots and prevent the root of nutrients