Monitoring for Change of Soil Characteristics by repeated Organic Supply of Comport and Green Manures in Newly reclaimed Organic Upland Field
2015
Ok, J.H., National Academy of Agricultural Science, RDA, Wanju, Republic of Korea | Cho, J.L., National Academy of Agricultural Science, RDA, Wanju, Republic of Korea | Lee, B.M., National Academy of Agricultural Science, RDA, Wanju, Republic of Korea | An, N.H., National Academy of Agricultural Science, RDA, Wanju, Republic of Korea | Shin, J.H., National Academy of Agricultural Science, RDA, Wanju, Republic of Korea
This study was conducted to evaluate the effect of organic inputs on soil properties in a newly reclaimed organic soils. The soil of the experiment site was very low in soil fertility and the physico-chemical properties were poor. Several organic input treatments with different source of nutrient were placed, including compost in combination with green manures for organic agricultural practices, chemical fertilizers for conventional agricultural practices, and control without fertilizer. The experiment was conducted with continuous cropping system during 3 years. The chemical properties concentration in compost+green manure treatment was increased continually compare to control and chemical fertilizer treatment, and closed to the recommended rate of fertilizer. The organic matter value for compost+ green manure treatment was increased from 0.86~0.96% to 2.00~2.29% by continuous nutrient supply of compost and green manure. However, further investigation on increasing of organic matter value for 3 years is necessary to monitor carefully during the long-term because it will help to clarify the all mechanisms of organic matter on organic input application way. The available phosphate value for compost+ green manure treatment was generally increased from 21.9~27.1 mg/kg to 182.0~ 394.1 mg/kg. In case of exchange cation, the concentration for compost+ green manure treatment was increased during 2 years within the range to the recommended rate of fertilizer, however, it is expected to cause a rather over supply for 3 years.
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