棚室蔬菜生产管理不当会造成一些生理障碍和危害,须注意防治。1.盐分累积障害棚室内施用肥料后,除植物吸收外,剩余部分全部聚积在土壤中,一些可溶性盐如K~+、Ca~(2+)、HCO 等浓度过高会造成根系周围土壤溶液渗透压增高,致使根部养分和水分外渗,严重阻碍水分吸收,植物生长受阻,重者死亡。同时土壤溶液盐分含量过高,施磷肥后会被土壤吸附固定,植株不能吸收,造成 Improper vegetable production management in the greenhouse will result in some physical obstacles and hazards and prevention and control should be paid attention to. 1. Accumulation of salt accumulation After indoor application of fertilizers, except the plant absorption, the remaining part of the accumulated in the soil, some soluble salts such as K ~ +, Ca ~ (2 +), HCO and other concentrations can cause soil around the root solution Increased osmotic pressure, resulting in root nutrients and water extravasation, a serious impediment to water absorption, plant growth retardation, severe cases of death. At the same time, the salt content of soil solution is too high, after applying phosphate fertilizer will be soil adsorption and fixation, plants can not be absorbed, resulting in