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Organic materials used were compost, rice straw, and hairy vetch and compared with conventional farming. K and Ca contents of soil were increased by application of organic materials compared to those of conventional farming while P content in soil was decreased in organic farming with application of compost and hairy vetch. Crop productivity was higher in application of hairy vetch compared to those of compost or rice straw. In conclusion, organic farming was more beneficial for the improvement of soil properties and the use of hairy vetch as green manure was more effective than compost or rice straw for the maintenance of crop yield and enhancement of soil properties.