Effect of Consequent Application of Pig Manure Compost on Soil Chemical Properties and Dehydrogenase Activity in Volcanic Ash Soil

This study were carried out to evaluate effect of consequent application of pig manure compost (PMC) on soil chemical properties, dehydrogenase activity, and yield of potato in volcanic ash soil. The more application rate of PMC increased, the more increased soil pH, total-nitrogen, available phosphate, exchangeable cations (K, Ca, and Mg), heavymetal (Zn and Cu)contents. When application rate of PMC and crop cultivation times increased gradually, soil dehydrogenase activity was significantly increased. After third cultivation period, dehydrogenase activity showed PMC 2 ton (3.5), PMC 4 ton (6.3), PMC 6 ton (8.0 ug TPF ), respectively. The activity was twofold higher than first cultivation period. During the third cultivation period, dehydrogenase activity increased linearly comparison to Cu and Zn contents and that was correlated with Cu (=0.907) and Zn (=0.859) content, respectively. As the application rate of PMC increased, the yield of potato increased, but NPK+PMC 2 ton treatment was more higher than other treatments.

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