Dynamics of Microbial Biomass Nitrogen as Influenced by Organic Matter Application in Paddy Fields : I. Fate of Fertilizer and Soil Organic N Determined by <15>^N Tracer Technique
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概要
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The effects of annual application of rice straw or cow manure compost for 17-20 y on the dynamics of fertilizer N and soil organic N in Gley paddy fields were investigated by using the 15N tracer technique during the rice cropping season. The chloroform fumigation-extraction method was evaluated to determine the properties of soil microbial biomass under submerged field conditions at the tillering stage before mid-summer drainage, with special reference to the fate of applied NH_4^+-<15>^N. _he transfer ratios from applied NH_4^+-<15>^N to immobilized N in soil and to uptake N by rice during given periods varied with the rice growth stages and were affected by organic matter application. The accumulated amounts of netmineralized soil organic N (net-M_j), immobilized N (I_j), and denitrified N (D_j) during the cropping season were estimated to be 14.0-22.5, 6.3-11.2, and 3.4-5.3 g N m^<-2>, respectively. Values of net-M_j and I_j were larger in the following order: cow manure compost plot > rice straw plot >plot without organic matter application, and their larger increase by the application of cow manure compost contributed to a decrease of the D_j values, as compared with rice straw application. Values of E_N, extra extractable soil total N after fumigation, increased following organic matter application, ranging from 2.1 to 5.4 g N m^<-2>. Small residual ratios of applied <15>^N in the fraction E_N at the end of the given period indicated that re-mineralization of newly-assimilated <16>^N through the easily decomposable fraction of microbial biomass had almost ended. Thus, the applicability to paddy field soils of the chloroform fumigation-extraction method cability to paddy field soils of the chloroform fumigation-extraction method was confirmed.
- 社団法人日本土壌肥料学会の論文
著者
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Inubushi Kazuyuki
Faculty Of Agriculture The University Of Tokyo
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Shibahara Fujiyoshi
Shiga Prefecture Agricultural Experiment Station
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Shibahara F
Shiga Prefecture Agricultural Experiment Station
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Yamamuro Shigekazu
Faculty of Agriculture, Saga University
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Yamamuro Shigekazu
Faculty Of Agriculture Saga University
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