• Korean Journal of Soil Science and Fertilizer
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• v.25 no.3
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• pp.270-274
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• 1992

This study was observed to find out the relationship of soil microorgaism physico-chemical properties and yields on the continuous cultivation of peanuts soil in the difference 20 farmes field located in Gochang, Chonbuk area. The results obtained was summarized as follows : 1. Soil hardness and volume of soild and liquid of peanut continuous cultivation soil were higher than those of one year cultuvation. 2. The exceeding optimum level of phosphorus and potassium appeared factors affecting and reduction of peanut continuous cultivation soil. 3. Number of microorgaisms in continuous cultivation soil was high but the ratio of bacteria/fungi (B/F) and actinomycetes/fungi (A/F) ratio were low. 4. The number of soil nematodes in continuous cultivation soil were higher than that of alternative cultivation soil.

• Microbiology and Biotechnology Letters
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• v.20 no.4
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• pp.395-400
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• 1992

A novel strain of HSL613 producing a large amount of cholesterol oxidase as an extra~ cellular enzyme was isolated from soil samples. Experiments were carried out to optimize the condition of cholesterol oxidase production using HSL613 strain. This microorganism was shown to give the maximum yield f)f cholesterol oxidase in the medium containing 2% glucose, 2% yeast extract, 0.2% $K_2HP0_4$, 0.1% NaCl. 0.005% $CaCl_22H_2O, 0.001% $FeSO_47H_20$. The optimum temperature was $30^{\circ}C$ and the enzyme production reached a maximum level at 144 hours of cultivation (10.3$\mu$/ml).