Incorporation of Nitrogen from Urea Fertilizer into Soil Organic Matter in Rice Paddy and Cassava Upland Fields in Indonesia
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概要
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Incorporation of newly-immobilized N into major soil organic matter fractions during a cropping period under paddy and upland cropping systems in the tropics was investigated in Jawa paddy fields with and without fish cultivation and a Sumatra cassava field in Indonesia. ^15N-labelled urea (^15N urea) was applied as basal fertilizer, and the soil samples were collected after harvest. The percentage of distribution of the residual N in soil from ^15N urea into the humic acids, fulvic acid fraction, and humin were 13.1-13.9, 19.0-20.5, and 53.4-54.3%, respectively, for the Jawa paddy soils, and 14.9, 27.4, and 52.4%, respectively, for the Sumatra cassava soil. These values were comparable to the reported ones for other climatic zones. The percentage of distribution of ^15N urea-derived N into humic acids was larger than that of total N into the same fraction in all the soils. The distribution into the fulvic acid fraction was also larger for ^15N urea-derived N than for total N in the Jawa soils. Humic and non-humic substances in the fulvic acid fraction were separated using insoluble polyvinylpyrrolidone (PVP) into the adsorbed and non-adsorbed fractions, respectively. Less than 5% of the ^15N urea-derived N in fulvic acid fraction was detected in the PVP-adsorbed fraction (generic fulvic acids). The proportion of non-hydrolyzable N remained after boiling with 6 M HCl in the ^15N urea-derived N was 9.4-13.5%, 17.3-26.7%, and 8.4-16.6% for the humic acids, generic fulvic acids, and humin, respectively. The significantly low resistance to acid hydrolysis suggested that the ^15N urea-derived N was less stable than the total N in soil regardless of the fractions of humus.
- 社団法人日本土壌肥料学会の論文
著者
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Watanabe Akira
Graduate School of Bioagricultural Sciences, Nagoya University
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Watanabe A
Nagoya Univ. Nagoya Jpn
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Ando Ho
Faculty of Agriculture, Yamagata University
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Ando H
Faculty Of Agriculture Yamagata University
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Ando Ho
Faculty Of Agriculture Kagawa University
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Ardjasa W
Research And Assessment Installation For Agriculture Technology
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Abe Tomonori
名大院生命農
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Abe Tomonori
Graduate School of Bioagricultural Sciences, Nagoya University
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Suwandhi Sambudhi
Faculty of Agriculture, Gadja Mada University
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Ardjasa Wayan
Taman Bogo Experiment Station, Department of Agriculture, Purbolinggo Village
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Suwandhi Sambudhi
Faculty Of Agriculture Gadja Mada University
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Watanabe A
Research Division For Development Of Anti-infection Agents Institute Of Development Aging And Cancer
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Watanabe Akira
Graduate School Of Bioagricultural Sciences Nagoya University
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Suwandhi S.Sambudhi
Faculty of Agriculture, Gadja Mada University
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