地势低洼,渍害严重,土壤下潜上渍,土质粘重,僵板粘闭,土壤养分难以被作物利用是昆山县中低产土壤低产的主要原因。用治渍增肥措施能改善土壤理化性状,其增产效果和经济效益也十分显著。 The main reason for the low yield of middle and low yield soils in Kunshan is the low lying, the heavy stains, the submerged stain on the soil, the stickiness of the soil, the stickiness of the stiff plate, and the difficult utilization of soil nutrients by crops. Soil and chemical properties of soil can be improved by treating soil and increasing fertilizers, and its yield and economic benefits are also significant.