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On the chemical structure and plant growth-promotion effects of environmental humic acids.

Research Project

Project/Area Number 60470124
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 土壌・肥料
Research InstitutionKyoto Prefectural University

Principal Investigator

YONEBAYASHI Koyo  Kyoto Prefectural University. Associate Professor, 農学部, 助教授 (00046492)

Co-Investigator(Kenkyū-buntansha) YAMADA Hidekazu  Kyoto Prefectural University, Lecturer, 農学部, 講師 (60094405)
HATTORI Tomoo  Kyoto Prefectural University, Professor, 農学部, 教授 (50046413)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1987: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1986: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1985: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsHumic acid / Syructural analysis / ^1H-NMR / Number-average molecular weight / Surface activity / Plant growth promotion / 植物生育促進効果 / Mg吸収能 / 【^1H】-NMR / 植物生育促進作用
Research Abstract

Forth humic acid samples were extracted from various types of soils, including aquatic sediment. Each source of humic acid was analysed for elemental conpositions and contents of carboxyl, low pka carboxyl, carbonyl, phenolic and alcoholic hydroxyl groups. From the visible and ^1H-NMR spectra of various types of humic acids, optical properties and proton compositions (aromatic, methoxyl, lactone, aliphatic-<alpha>, -<beta>, -<gamma>) were compared.
Factor analysis clarified that the humic acid was first characterized by the contents of aliphatic chains and nitrogenous components, followed by functional groups contents and optical properties. Soil groups of the source of humic acids could be judged by discriminant analysis on the above characteristics.
Structural analysis developed in coal chemistry was modified to apply to humic acids. Average molecular structure parameters (f_a H_<au>/C_a, <sigma>, n) were calculated from elemental composition, functional groups composition and proton composition. The higher the humification digrees were, the larger the condensation degrees were and the shorter the side chain lengths were.
Number-average molecular weight of well humified humic acids were lower than low humified ones. Surface tension of humic acids solution were measured. High molecular weight fraction and the humic acids holding high number-average molecular weight exhibit high surface activity.
To test the effect of humic acids on plant growth, rice was cultivated in water aculture containing nutrients. Ion uptake was estimated by the analysis of exudate and plant tops. The uptake of magnesium was enhanced by humic acids. Most effective humic acid was extracted from Entisol and characterized by the followings; low condensation of aromatic rings, long side chain, high number-average molecular weight and high surface activity.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Yonebayashi, K.;Hattori, T.: The Science of the Total Environment. 62. 55-64 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi, K.;Hattori, T.: Soil Science and Plant Nutrition. 34. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi, K.;Hattori, T.: Soil Science and Plant Nutrition.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi, K.;Hattori, T.: Soil Science and Plant Nutrition.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi, K.;Hattori, T.: Soil Science and Plant Nutrition.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi,K. and Hattori,T.: "Surface active properties of soil humic acids." The Science of the Total Environment. 62. 55-64 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayoshi,K. and Hattori,t.: "Elemental and functional group compositions of humic acids. On the chemical and biological studies of environmental humic acies. I." Soil Science and Plant nutrition. 34. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi,K. and Hattori,T.: "1H-NMR and IR spectra of humic acids." Soil Science and Plant Nutrition.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi,K. and Hattori,T.: "Structrural analysis of humic acids." Soil Science and Plant Nutrition.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Yonebayashi,K. and Harrori,t.: "Number-average molecular weight of humic acids." Soil Science and Plant Nutrition.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Yonebayashi;T.Hattori: Science of total environment. 62. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] K.Yonebayashi;T.Hattori: Soil Sci.Plant Nutri.

    • Related Report
      1986 Annual Research Report
  • [Publications] K.Yonebayashi;T.Hattori: Soil Sci.Plant Nutri.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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