NITROGEN FIXATION IN PADDY SOILS : I. Factors Affecting N_2 Fixation

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概要

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• The 4 long-term experimental plots (Umbric haplaquept) with different fertilizer treatment at Cent. Agric. Exp. Sta. in Konosu City, Saitama Prefecture, were used for the sites of investigation. The 4 plots were NF (applied with no fertilizer), IF (applied with inorganic fertilizers), GM (applied with green manure and CaCO_3), and OM (applied with manure and inorganic fertilizers). Flooded water, floating weed, upper (0-2 cm) and lower (2-10 cm) parts of Apg horizon and rhizosphere were collected from each plot before flooding, during flooding and after drainage. These samples were analyzed for N_2-fixing activity by acetylene reduction method, pH, Eh, and contents of Fe^<2+>, NH_4^+, chlorophyll-type compounds, and water-soluble carbohydrates. The N_2-fixing activity of all samples showed almost the same pattern of change with time : very low before flooding, rapidly increased after flooding, the maximum value at the maximum tillering stage of rice plant, declined afterwards and reached a very low value after drainage. Rough estimation of the "N_2-fixing capacity" of each part of the paddy field revealed that the most important site of the N_2 fixation was the reduced Apg horizon, that the importance of flooded water and/or the oxidized layer in the N_2 fixation was rather low except in infertile soil, and that the role of rhizosphere in the N_2 fixation could not be neglected also in Japan. Reduced condition and content of easily decomposable organic substances were judged to be main factors which control the N_2-fixing activity in the flooded soil on the basis of correlations between the N_2-fixing activity and several analytical data of the paddy soils.

• 社団法人日本土壌肥料学会の論文

著者

• Kimura Makoto

  School Of Agriculture Nagoya University

• Panichsakpatana Supamard

  Department of Soils, Kasetsart University

• Wada Hidenori

  Faculty of Agriculture, The University of Tokyo

• Takai Yasuo

  Nodai Research Institute,Tokyo University of Agriculture

• KIMURA Makoto

  Faculty of Agriculture, The University of Tokyo

• TAKAI Yasuo

  Faculty of Agriculture, The University of Tokyo

• PANICHSAKPATANA Supamard

  Faculty of Agriculture, the University of Tokyo

• Wada Hidenori

  Faculty Of Agriculture The University Of Tokyo

• Takai Y

  Nodai Research Institute Tokyo University Of Agriculture

• Takai Yasuo

  Faculty Of Agriculture The University Of Tokyo

• Panichsakpatana S

  Kasetsart Univ. Bangkok Tha

• Panichsakpatana Supamard

  Faculty Of Agriculture Kasetsert University

• Panichsakpatana Supamard

  Department Of Soil Science Kasetsart University

• Kimura Makoto

  Faculty Of Agriculture Kyushu University Graduate School

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