大棚蔬菜要“三防”防盐化①深翻改土，结合耙地，适量掺沙，改善土壤结构，提高土壤通透性，促盐分下渗。②增施有机肥料，每亩可施入堆肥、窖肥或厩肥１０００一２０００公斤作底肥，以增加土壤有机质的含量，使土壤疏松，促盐分下渗。③换土消盐：即铲除大棚土壤表层２... Greenhouse vegetables should be “three defenses” against salinization ① deep turning the soil, combined with rake, appropriate amount of sand, improve soil structure, improve soil permeability, and promote salt infiltration. ② increase the application of organic fertilizer, per mu can be applied composting, pit manure or 1000-2000 kg as base fertilizer, in order to increase the content of soil organic matter, so that the soil loose, and promote salt infiltration. ③ soil desalination: that eradicate the shed soil surface 2 ...