大棚生产多为间、套、混种栽培形式,复种指数高,休闲时间短。为获取大棚牛产的高效益,人们投入大量化肥,由于温室无流失条件,大部分肥料被作物吸收后,剩余未被吸收的各种强酸性阴离子残留在上壤中,常年聚积就会使上壤浓度过高,造成上表盐类的积聚,严重地影响蔬菜的产量与品质,致使效益降低,因此必须认真地加以防治。 Greenhouses production mostly room, cover, mixed cultivation forms, multiple crop index high, leisure time is short. In order to obtain the high efficiency of greenhouses, people invest a lot of fertilizers. Due to the no-loss conditions in the greenhouses, most of the fertilizers are absorbed by the crops, and the remaining un-absorbed various strong acid anions remain in the soil. Soil concentration is too high, resulting in the accumulation of the above table salt, seriously affecting the yield and quality of vegetables, resulting in reduced efficiency, it must be carefully to prevent and cure.