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Changes of Physico-chemical Properties and Microflora of Pig Manure due to Composting with Turning Times and Depth  

Lee, Sang-Bok (National Honam Agricultural Experiment Station, RDA)
Kim, Jeong-Goo (National Honam Agricultural Experiment Station, RDA)
Lee, Deog-Bae (National Honam Agricultural Experiment Station, RDA)
Lee, Kyeong-Bo (National Honam Agricultural Experiment Station, RDA)
Han, Sang-Soo (National Crop Experiment Station, RDA)
Kim, Jai-Duk (Research Management Bureau, RDA)
Baek, Seung-Hwa (Department of Food Science and Technology, Chungbuk Provincial Okchon College)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.35, no.2, 2002 , pp. 127-135 More about this Journal
Abstract
This study was conducted to investigate the physico-chemical and microbiological properties in profile depth during composting process with different turning times when pig manure was composted with ground rice hulls at the rate of same for the promotion of the composting. The moisture contents, C/N rate and pH value decreased according to composting progresses as run into turning times, but increased those inside layer of the pile. $NH_4-N$ and $NO_3-N$ contents were high in the outer layer mostly, as the result the $NH_3$ flux was high in there, but it decreased as composting progresses. The number of aerobic bacteria were $10^7{\sim}10^9\;cfu\;g^{-1}$, increased as the turning times, the number of their showed high in the outer layer. The number of fungi were $10^2{\sim}10^4\;cfu\;g^{-1}$ at the early period of composting, but did't almost survive inside layer as composting progresses. The number of cellulose decomposer and thermophilic bacteria were $10^6{\sim}10^7\;cfu\;g^{-1}$ and $10^6{\sim}10^9\;cfu\;g^{-1}$, respectively, they showed high inside layer of the pile. Therefore, the turning of composting can reduce the change difference of microorganisms in the pile. Turning frequence for the promotion of composting showed approximately 2~3 times.
Keywords
Pig feces; Composting process; Turning times; Microflora; Physico-chemistry;
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