THE EFFECTS OF SOIL CONDITIONS AND NITROGEN FORM ON N_2O EVOLUTION BY DENITRIFICATION

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概要

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• Nitrous oxide evolution from the soils treated with nitrogen fertilizer such as ammonium sulfate or sodium nitrate under different environmental conditions was measured by the combined method of gas chromatography and emission spectrometry (GC-ES). When NH_4^+ was added, two evolution peaks of N_2O were detected. Eighty to 94% of the first peak was derived from endogenous soil nitrogen and about 75% of the second peak was derived from added fertilizer nitrogen. When NO_3^- was added, there appeared only one peak, which was derived mostly (92-97%) from fertilizer nitrogen. The quantity of N_2O evolved varied widely according to the kind of fertilizer, soil moisture content and content of easily decomposable organic matter of soil. The maximum amount of N_2O evolved during a period of 23 days was 19.5% in the soil to which nitrogen had been applied as NO_3^-, for a supply of 0.1% glucose per dry soil and water depleted-treatment. The minimum amount was 0.005% in the soil which received fertilizer as NH_4^+ for a supply of 1.0% glucose in the water-saturated treatment.

• 社団法人日本土壌肥料学会の論文

著者

• Kumazawa K

  Tokyo Univ. Agriculture Tokyo Jpn

• Kumazawa Kikuo

  Department Of Agricultural Chemistry The University Of Tokyo

• KUMAZAWA Kikuo

  Laboratory of Plant Nutrition and Fertilizers, Department of Agriculture, the University of Tokyo

• Owa N

  Department Of Farm Chemicals National Institute Of Agro-environmental Sciences:(present Address)depa

• MURAKAMI Toshifumi

  Laboratory of Plant Nutrition and Fertilizer, Faculty of Agriculture, The University of Tokyo

• OWA Naoto

  Laboratory of Plant Nutrition and Fertilizer, Faculty of Agriculture, The University of Tokyo

• Murakami T

  Nagano Chushin Agricultural Experiment Station:(present Address)national Agriculture Research Center

• Murakami Toshifumi

  Laboratory Of Plant Nutrition And Fertilizer Faculty Of Agriculture The University Of Tokyo

• Kumazawa Kikuo

  Laboratory Of Plant Nutrition And Fertilizer Faculty Of Agriculture The University Of Tokyo

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