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This study was carried out to evaluate effect of consecutive application of organic matter on soil chemical properties and dehydrogenase, acid phosphatase activity in non-volcanic ash soil during three cropping season. Organic matter mixture and organic fertilizer (MOF, ), food waste compost (FWC, ), and pig manure compost (PMC, 2,000, 4,000, and ) were applied for each cropping season. Soil pH values were increased after three cropping season in all treatment. In the soils of the increased application of PMC, soil pH, total-nitrogen, available phosphate, exchangeable cations (K, Ca, and Mg), and heavy metal (Zn and Cu) contents were increased. In addition, Soil dehydrogenase activity was significantly increased in proportions to PMC application rate and cropping season during potato cultivation period. The activity was two times higher in PMC () than control after the third cropping season. Soil dehydrogenase activity was in order of PMC>FWC>NPK+PMC>MOF. Acid phosphatase activity was higher in PMC () than other treatment. Soil Zn content and dehydrogenase activity showed linearly correlation, which were MOF (=0.427), FWC (=0.427) and PMC (=0.411, p

Effect of Consecutive Application of Organic Matter on Soil Chemical Properties and Enzyme Activity in Potato Cultivation Soil