长期施用沼肥对桑园土壤肥力的影响

摘要

沼肥是生物质经过沼气池厌氧发酵的产物,富含N,P,K及大量微量元素和生物活性物质[1],可以显著增加桑园土壤中＞0.25 mm水稳性团聚体的含量,大幅度提高土壤有机质含量、全氮含量、速效磷含量、速效钾含量,提高土壤保肥能力,提高土壤等级.通过试验,连续五年施用足量沼肥,已经对桑园土壤改良起到显著效果,此后维持正常的施入量即可.%The biogas fertilizer is rich in N,P,K,trace elements and bioactivators[1],and can significantly increase the content of waterstable aggregate of ＞ 0.25 mm in mulberry field soil.The largest increasing could reach 61.58％.The biogas fertilizer could also increase the soil organic matter,total nitrogen content,available phosphorus and potassium,etc.Their largest increasing could reach 111.79％,80.88％,142.43％,80.88％,respectively.So it significantly improved the soil quality.The experiment showed that,after adequate application of biogas fertilizer for 5 consecutive years,the soil had a significant improvement on mulberry field.