Nutrient Leaching from the Plow Layer by Water Percolation and Accumulation in the Subsoil in an Irrigated Paddy Field(Soil Physics)
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概要
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To estimate the impact of water percolation on the nutrient status in paddy fields, the seasonal variations of the concentrations of cations, anions, inorganic carbon (IC), and of dissolved organic carbon (DOC) in percolating water that was collected from just below the plow layer (PW-13) and from drainage pipes at the 40 cm depth (PW-40), as well as in irrigation water were measured in an irrigated paddy field. Total amounts of Ca, Mg, K, Fe, and Mn leached from PW-13 during the period of rice cultivation were estimated to range from about 390 to 770, 65 to 130, 33 to 66, 340 to 680, and 44 to 87 kg ha^<-1>, respectively. Amounts of losses that were estimated from the differences between the input by irrigation water and the output by percolation water from the plow layer corresponded to 11 to 26, 22 to 47, 5.9 to 12, and 13 to 26% of exchangeable Ca and Mg, amorphous Fe, and easily reducible Mn in the plow layer, respectively. The concentrations of Ca, Mg, K, Fe, and Mn in PW-13 were higher than those in PW-40. The amounts of these nutrients that were retained in the subsoil between the 13 cm and 40 cm soil depth corresponded to 83, 86, 61, 99, and 89% of the amounts that percolated from the plow layer, respectively. Total amounts of IC and DOC that percolated from the plow layer ranged from 750 to 1,500 and 85 to 170 kg-C ha^<-1>, which corresponded to 5.0 to 10.0% and 0.6 to 1.1% of the total carbon content in the plow layer, respectively. Eighty eight % of IC in the percolating water from the plow layer was also retained in the subsoil.
- 社団法人日本土壌肥料学会の論文
著者
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KIMURA Makoto
Graduate School of Bioagricultural Sciences, Nagoya University
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木村 真人
Laboratory Of Soil Biology And Chemistry School Of Agricultural Sciences Nagoya University
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Kimura Makoto
Nagoya Univ. Aichi Jpn
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MURASE Jun
Graduate School of Bioagricultural Sciences, Nagoya University
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Matsuya Kazuo
Laboratory of Crop Science, Aichi-ken Anjo Research and Extension Center
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Hayashi Motoki
Laboratory of Crop Science, Aichi-ken Anjo Research and Extension Center
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Katoh Masahiko
Graduate School of Bioagricultural Sciences, Nagoya University
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Hayashi Motoki
Aichi-ken Anjo Research and Extension Center
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Matsuya Kazuo
Aichi-ken Anjo Research and Extension Center
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Katoh Masahiko
Graduate School Of Bioagricultural Sciences Nagoya University:(present Address)zen-noh Agricultural
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Kimura M
Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi
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Kimura M
School Of Agriculture Nagoya University
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Murase Jun
Graduate School Of Bioagricultural Sciences Nagoya University
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Murase J
Graduate School Of Bioagricultural Sciences Nagoya University
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Mtsuya Kazuo
Laboratory Of Crop Science Aichi-ken Anjo Research And Extension Center
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Matsuya Kazuo
Laboratory Of Crop Science Aichi-ken Anjo Research And Extension Center
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Murase J
Nagoya Univ. Nagoya Jpn
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Kimura Makoto
Graduate School Of Bioagricultural Sciences Nagoya University
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Kimura Makoto
Graduate School Of Agricultural Sciences Nagoya University
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Murase Jun
Graduate School of Bioagricultural Science, Nagoya University
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