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近年大棚蔬菜栽培经济效益好,面积成倍上升,发展极为迅速。但保护地施肥量大,大棚土壤栽培年限的增加,土壤盐渍化日趋严重。因环境封闭、施肥多、温度高、土表不加覆盖条件下,土壤中可溶性盐分随地下水上升,水逸盐留,又无雨水冲洗,表土盐分不断积累,从而导致土壤溶液浓度过高,渗透压过大,影响蔬菜根系的吸收。被害蔬菜表现为:植株矮小,发育不良,叶色浓绿,有时叶表面覆盖一层蜡质,严重时,从叶缘开始枯死或变褐内卷。防御大棚蔬菜盐害可采取以下措施:
In recent years, the economic benefits of greenhouse vegetable cultivation are good, the area has doubled and the development has been extremely rapid. However, a large amount of fertilizer was applied in protected areas and the cultivation period of greenhouse soil was increased, and soil salinization was becoming more and more serious. Due to the closed environment, high fertilization, high temperature, soil surface without covering conditions, the soil soluble salt rises with the groundwater, salt and salt water stay, without rain washing, surface salt accumulation, resulting in high soil solution concentration, penetration Pressure is too large, affecting the absorption of vegetable roots. Victims of vegetables as follows: plant dwarf, dysplasia, leaf color dark green, and sometimes leaf surface covered with a layer of wax, serious, from the leaf edge began to die or browning in the volume. Prevention of vegetable salt damage in greenhouse can take the following measures: