畜禽废弃物高温好氧堆肥过程中磷素的变化研究

用猪粪进行高温好氧堆肥,在堆肥过程中分别加入0%、5%、7.5%、10%湿重堆肥质量的过磷酸钙,研究了堆肥进程中磷素的变化。结果表明,加入无机磷后能显著提高有效磷含量,平均分别提高45%、59%和62%,并且有相当部分的无机磷转变成有机态磷,提高了磷的有效性及利用率,为减少无机磷被土壤固定、提高磷素的当季利用率提供了一种可行途径。

Dynamic Phosphorus Contents During Aerobic and Rmophilic Composting of Livestock Wastes

It has been recognized that the fertilizers of inorganic phosphate are easy to be fixed by soil and utilization rates are only 10 to 25%. It is generally assumed that organic acids produced during composting of rock phosphateare mainly responsible for solubilizing insoluble phosphates. Aerobic and thermophilic composting of pig manure, mixed with 0, 5, 7.5, and 10 %, respectively, superphosphate based on wet quantity of the composting are studied in our test. The results indicated that available P increased by about 45%, 59%, and 62%, respectively, and a quite part of the superphosphate was changed into organic phosphorus. The rates of P solubilization was well correlated with C/P of themedium, and the correlation of organic phosphorus and C/P was y=0.347x-0.00304. The total P also increased because of the decomposing of the organic matters.During the process of composting, P enhanced its effectiveness and use efficiency, which may provide a method that can enhance the rate of utilization of inorganic phosphorus favorable to soil.