| Project/Area Number |
16380049
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | Kobe University |
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Principal Investigator |
FUJITAKE Nobuhide kobe university, faculty of agriculture, Asscciate professor, 農学部, 助教授 (50243332)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Takeshi Kobe University, Faculty of Agriculture, Assistant Professor, 農学部, 助手 (10321952)
KAWAHIGASHI Masayuki Nihon university, College of bioresource science, Lecturer, 生物資源科学部, 講師 (60297794)
YONEBAYASHI Koyo Ishikawa prefectural University, Faculty of Bioresource and Environmental Science, Professor, 生物資源環境学部, 教授 (00046492)
YANAGI Yukiko Minamikyusyu University, Faculty of Horticulture, Lecturer, 園芸学部, 講師 (20412819)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2005: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 2004: ¥7,700,000 (Direct Cost: ¥7,700,000)
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| Keywords | humic substances / humic acids / fulvic acids / dissolved organic matter / NMR spectroscopic analysis / HPSEC analysis / diversity / poly-dispersed |
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| Research Abstract |
Humic substances are most predominant organic carbon on the surface layer of the earth, and are distributed ubiquitously on there. The objective of this study was to propose the visual and actual models of humic substances for enlightening their importance. Humic substances were analyzed from point of view of diversity and poly-dispersed properties.
Results were described as follow:
1) A number of samples that were generated from various sources materials and/or different environmental condition were obtained, and the database were constructed from analytical data of carefully screened samples (83 from soils, 75 from rivers and lakes, 13 from soil solution, and 11 from manure etc.), by using NMR analysis, elemental analysis and HPSEC analysis.
2) Among soil humic acids from A horizons, their chemical properties differ among soil types. Among rivers and lakes humic substances, their chemical properties differ from colored water to clear water. For water-soluble humic substances in soils, their chemical properties were similar among samples from 0 horizons while were different among samples from A horizons.
3) The grouping model for humic substances was accomplished by the database as described above 1), and visual image of each group of humic substances were proposed on the basis of the grouping model.
4) On the basis of the grouping model for humic substances, typical humic acids from four types were selected and divided to 64 fractions by sequential extraction techniques and preparative HPSEC technique. As a results, the fraction samples reduced the poly-dispersed properties of humic substances were obtained. It was shown by the analytical data that changes of chemical properties with changes of their molecular sizes in each humic acid.
5) After taking every factor into consideration, the visual image comprehended diversity and poly-dispersed properties of humic substances were proposed.
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