On the Effect of Addition of Glucose to Nitrification in Pasture Soil of Volcanic Ash Origin Examined by Soil Perfusion Method
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To characterize volcanic ash soil used for pasture receiving different level of cattle manure, soil perfusion with ammonium and glucose was carried out for 25 days. The effect of additional glucose to nitrification was examined. Soil used were : heavily manured soil (HM), moderately manured soil (HO), soil with eroded surface (LO), soil applied only with chemical fertilizer (G), and in addition to above mentioned pasture soils, soil used for vegetable crops, applied with chemical fertilizer (V), was used. Using three levels of additional glucose to bring the C/N of perfusing solution equal to 5,10,15 was a useful approach to characterize soils in term of capability of ammonium oxidation. For soils of LO, G, V, even at C/N equal to 5,no nitrification was observed. For soils of HM, HO, at C/N equal to 10,nitrification was observed, though HO had longer suppression period of nitrification. At C/N equal to 15,soil of HO did not show nitrification but of HM showed nitrification.
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- On the Effect of Addition of Glucose to Nitrification in Pasture Soil of Volcanic Ash Origin Examined by Soil Perfusion Method