大棚内的土壤。随着栽培年头的增加,土壤盐化程度日趋严重。从而影响大棚蔬菜的品质和产量。 一、大棚土壤盐化的原因。 1、大棚内的土壤。因不受降雨条件的影响,其盐分不能随雨水流失淋溶到深层土壤中去。而残留在耕层土壤内。 2、大棚栽培。由于灌水次数频繁。土壤团粒结构遭到了破坏。导致大孔隙减少,通透性变差。使土壤形成板结层。盐分不能渗透到土壤深层。而随水上升到土壤耕层。水分蒸发使盐分积聚下来。 3、地势低洼。土壤湿度过大,土壤表层积累了大量 Soil in the greenhouse. With the increase of planting years, the degree of soil salinization becomes more and more serious. Thus affecting the quality and yield of greenhouse vegetables. First, the reasons for greenhouse saltification. 1, the soil inside the greenhouse. Because it is not affected by rainfall conditions, its salt can not leach into deep soil with rainwater loss. While remaining in the topsoil. 2, greenhouse cultivation. Due to frequent irrigation. Soil aggregate structure has been destroyed. Resulting in reduced macropores and poor permeability. The formation of soil layer plate layer. Salt can not penetrate deeper into the soil. With the water rose to soil plow. Water evaporates and accumulates salt. 3, low lying. Soil moisture is too large, a large accumulation of soil surface