Chemical and Biological Evaluation of Maturity of Pig Manure Compost at Different C/N RatiosEnglish Full Text

HUANG GUOFENG; WU QITANG; LI FANGBAI; and J. W. C. WONG College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642 (China) Department of Biology, Hong Kong Baptist University, Hong Kong (China)

Abstract: Aerobic static pile composting （mechanical turning every 3 days） of pig manure was prepared at ＆ m3 windrow heaps. Sawdust was used as the bulking agent to provide additional carbon and to increase the porosity of the substrate. Two treatments at initial C/N ratios of 30 and 15, respectively, were designed in the study. Dissolved organic carbon （DOC）, soluble NH+4-N, C/N ratios in solid and aqueous phases, E4/E6 ratios, and seed germination index （GI） were determined to evaluate the maturity of the co-composts. Seed germination index, a biological parameter, was suggested as one of the most reliable maturity indicators for organic compost. The results showed that the treatment at the initial C/N ratio of 30 reached maturity after 49 days of composting; however, the treatment at the initial C/N ratio of 15 should require composting time of longer than 63 days to obtain maturation. Chemical multi-indicator evaluation was necessary, and the GI measurement was the recommended approach for maturity evaluation in the study.

Keywords：

C/N ratio; composting; maturity; pig manure;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S141

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Chemical and Biological Evaluation of Maturity of Pig Manure Compost at Different C/N RatiosEnglish Full Text

HUANG GUOFENG; WU QITANG; LI FANGBAI; and J. W. C. WONG College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642 (China) Department of Biology, Hong Kong Baptist University, Hong Kong (China)

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