Temporal changes in humic acids in cultivated soils with continuous manure application(Soil Chemistry and Soil Mineralogy)
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概要
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Although the application of manure to upland fields is believed to induce changes in the quality of humic substances in soil as well as the quantity, the direction and extent of these changes have not been elucidated. To understand temporal variations in humic acids, periodically collected soil samples from two fields, a Typic Hapludult (Togo) and a Pachic Melanudand (Kuriyagawa), with cattle manure and chemical fertilizer (CF) were examined. The content and degree of humification (darkening) of the humic acids were distinctly greater in Kuriyagawa than in Togo soil. Corresponding to the difference in the degree of humification, molecular size distribution, elemental composition, infrared (IR) spectra, and <13>^C cross polarization/magic angle spinning nuclear magnetic resonance (CPMAS NMR) spectra of humic acids differed between the two soils. Manure application at 40Mg ha^<-1> year^<-1> for 16 years (Togo) and at 80 or 160Mg ha^<-1> year^<-1> for 19 years (Kuriyagawa) resulted in greater humic acid content compared with plots with CF only because of its increase in the manured plots and/or decrease in the CF plots. Manure application at an extremely high rate (160Mg ha^<-1> year^<-1>) resulted in higher H content and greater signal intensities of alkyl C, O-alkyl C and amide C=O in the <13>^C CPMAS NMR and/or IR spectra. Although humic acids with larger molecule sizes increased in all the manured plots, differences between the humic acids from the plots with and without manure applied at practical levels in the elemental and spectroscopic analyses were small or scarce. These results were considered to be because of the similarity between the indigenous soil humic acids and the manure-derived ones in Togo soil (a low degree of humification) and because of the abundance of highly-humified humic acids in Kuriyagawa soil.
- 社団法人日本土壌肥料学会の論文
著者
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KITAMURA Shigeyuki
Graduate School of Biomedical Science, Hiroshima University
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Watanabe Akira
Graduate School of Bioagricultural Sciences, Nagoya University
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Yoshida Shigekata
Graduate School Of Bioagricultural Sciences Nagoya University
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KAWASAKI Shigeki
Graduate School of Bioagricultural Sciences, Nagoya University
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Kawasaki Shigeki
Graduate School Of Bioagricultural Sciences Nagoya University
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Kawasaki Shigeki
Graduate School Of Agriculture Kyoto University
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Kawasaki Shigeki
Nagoya Univ. Nagoya Jpn
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Kitamura Shigeyuki
Graduate School Of Bioagricultural Sciences Nagoya University
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Watanabe Akira
Graduate School Of Bioagricultural Sciences Nagoya University
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