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实践证明,化肥深施比浅施可提高肥效15%～20%。其原因是: 深施减少了化肥流失。有些化肥(如硝态氮化肥)施入土壤后,其中硝酸根离子不能被土壤胶体吸附。有些土壤(如沙土)本身对化肥的保蓄能力就很差,遇暴雨或灌溉,便会随水或随土壤表层泥土一起流失。而化肥深施,由于土壤下层水移缓慢,随水流失就会大大减少。
Practice has proved that the application of fertilizer than the shallow Shi can improve fertilizer efficiency of 15% to 20%. The reason is: Shen facilities to reduce the loss of fertilizers. Some fertilizer (such as nitrate nitrogen fertilizer) applied to the soil, in which nitrate ions can not be adsorbed by soil colloids. Some soils (such as sand), which have very poor conservation of chemical fertilizers, can be lost with the water or with the soil of the soil in the event of heavy rainfall or irrigation. The fertilizer facilities, due to the slow movement of the soil water slowly, with the loss of water will be greatly reduced.