长期施用沼肥对桑园土壤肥力的影响

The Influence of Long-term Application of Biogas Fertilizer on Mulberry Field Soil

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 , 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,