Title: The Effects of Manure Composting on Distribution of Cu and Zn Speciations in Soils
Abstract: Due to the commonly oversupplied of Cu and Zn supplements in the animal feeding stuffs,their residues in the manure might pose potential threats on environment when manure is used in farmland. Composting is an effective way to treat animal manure,and might make the metal speciation less available. Incubation experiments,in which the mining soil and the vegetable garden soil were mixed with raw pig manure or its compost at different rates(0,50,200 t·hm-2) ,respectively,were conducted for 12 months to investigate the distribution of Cu and Zn speciations among two types of soils. The results showed that acetic acid soluble fraction and reducible fraction of Cu in pig manure were reduced by 9.2% and 17.2% after composting,while that of Zn decreased by 17.4% and 29.1%,respectively. The oxidable and residual fraction of Cu and Zn significantly increased after composting,and were mainly associated to the oxidable fraction in pig manure compost. After 12 months incubation,the reducible and residual Zn in vegetable garden soil were the primary fractions,with the proportions of 45% and 25%~43%,respectively. While in the mine soil,the residual Zn was significantly higher than the other three fractions. However,it showed that the residual and oxidable Zn partly transformed into the acetic acid soluble and reducible Zn after 12 months incubation. Furthermore,the composted pig manure might significantly promote the transformation of residual Zn to other fractions. The stability of Cu in soil amended by pig manure compost was higher than that amended by raw pig manure. Both the mining soil and the vegetable garden soil,mixed with pig manure compost,the soils contained the proportions of residual and oxidable Cu were higher than the soils mixed with raw pig manure. It was suggested that the composting treatment might significantly reduce the availability of Cu of pig manure,therefore reduce its pollution risk on soil,while adverse effect on Zn of pig manure was observed in this study.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 1
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