Title: Study on cassava waste composting and it's phosphorus transformation with pre-mixing insoluble phosphate
Abstract: This study conducted the aerobic composting process of cassava waste mixed with dried chicken manure,rice bran,cassava waste compost recycle and powdered rock phosphate.The change of physicochemical properties and phosphorus transformation of insoluble phosphate were analyzed during the composting process.The experimental design of composting included four treatments,i.e.,addition of rock phosphate at 0 (CK),10% (T1),15%(T2),20%(T3).In the composting,the addition amount of dried chicken manure,rice bran,and compost recycle were all at 10%,15% and 20%,respectively.The results showed that in the composting process,temperature above 55 ℃ lasted for 25 days which surpassed the national standard.At the end of composting,for all treatments,water content all declined to about 30%,pH value all increased to weak alkaline,degradation rates of starch were all above 90%,and content of dissolved organic carbon (DOC) all decreased to lower than 10 g·kg-1.These results indicate that the four treatments basically reached maturity standard and the composts were stable and harmless.Meanwhile,at the end of composting,the content of available phosphorus of T1,T2,andT3 increased by 12.58 g·kg-1,12.81 g·kg-1,12.96 g·kg-1,respectively and the trasformation rates of T1,T2,T3 were 23.53%,17.07%,14.50%,respectively.The results suggest that insoluble phosphate would be transformed to some extent in the process of cassava waste compost,which can provide a biological way to slove the problem of low plant available phosphorus in the composting production.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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