Nitrification and Denitrification in an Acidic Soil of Tea (Camellia sinensis L.) Field Estimated by δ^15N Values of Leached Nitrogen from the Soil Columns Treated with Ammonium Nitrate in the Presence or Absence of a Nitrification Inhibitor and with Slow
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概要
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Nitrification and denitrification processes of inorganic nitrogen (N) from several fertilizers placed in an acid soil (pH 4.1) of tea fields were examined in two experiments based on the NO_3-N leaching pattern from soil columns (20 cm depth) and on the δ^15N values of leached N. In the first experiment, ammonium nitrate (AN) was placed in the soil columns with and without dicyandiamide (DCD), a nitrification inhibitor. The NO_3-N content in the leachate was more than 10 times higher than the NH_4-N content and DCD application decreased the NO_3-N content in the leachate. The δ^15N values of the leached N with and without DCD initially decreased, with minimum values of - 3.8‰ and - 1.5‰, respectively, which were lower than that of applied AN (+ 0.7‰). These results showed that ^15N depletion occurred by the conversion of NH_4-N to NO_3-N through nitrification under acidic soil conditions (pH 4.1) and larger isotopic fractionation in the presence of DCD. In the second experiment, four slow-release fertilizers, isobutyriden diurea (IB), oxamide (Oxa), polyolefin-coated urea (100-d type; PCU), and rape seed meal (RSM), were placed in the soil columns and changes in the inorganic N content in the leachates were compared with the non-fertilized treatment. At the end of the experiment, the amounts of leached N were 52% and 44% in the treatment with Oxa and RSM, respectively, suggesting that organic N was strongly mineralized under the acidic soil conditions in the tea field. The δ^15N values of the leached N from the applied N were calculated from the isotopic balance as compared with the volumes of soil-derived N, which were asuumed to be the same in the presence or absence of fertilization. The cumulative δ^15N values of the leached N and of inorganic N remaining in soil suggested that some immobilization of fertilizer N had occurred in the treatment with PCU. The cumulative δ^15N values in the treatments with IB, Oxa, and RSM suggested the presence of high rates of denitrification, probably associated with the emission of nitrous oxide commonly observed in tea fields amended with organic materials like rape seed meal.
- 社団法人日本土壌肥料学会の論文
著者
-
Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo:(present Address)division Of Environmental
-
Morita Akio
Faculty Of Agriculture Shizuoka University
-
Takano Hiroshi
Shizuoka Tea Experiment Station
-
Oota Mitsuru
Shizuoka Tea Experiment Station
-
Yoneyama Tadakatsu
Department Of Agricultural Chemistry University Of Tokyo
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