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Surface-chemical study on effects of wet and dry conditions to soil colloids.

Research Project

Project/Area Number 09660069
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Plant nutrition/Soil science
Research InstitutionFukui Prefectural University

Principal Investigator

KITAGAWA Yasuo  Fukui Prefectural University, Department of Biosciences, Professor, 生物資源学部, 教授 (90254242)

Co-Investigator(Kenkyū-buntansha) ITAMI Katsuhiko  Fukui Prefectural University, Department of Biosciences, Lecturer., 生物資源学部, 講師 (60275089)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
KeywordsSoil Colloids / Charge Characteristics of Soil Particles / Dispersibility of Soil Particles / Particle-size Distribution of Soils / Soil Clay Mineralogy / 粘土鉱物学 / 界面化学 / 土壌粘土鉱物 / 荷電特性 / 粒径分布 / 土壌の乾湿
Research Abstract

The abnormal hardening of topsoil after puddlig so called "itsuki" has been serious problem in some rotational paddy fields of middle- to coarse-textured soils. This study was carried out for the purpose of clarifying the itsuki phenomenon by application of surface chemistry. The results is summarized as follows :
Total contents of iron oxides decreased, but amorphous iron oxides which affect closely to pH-dependent charge of soil colloides increased relatively, in the re-wetted soils after a strongly reductive procedure of the air-dried ones which were collected from continuous cropping paddy fields. Organic materials in these soils were also decreased by the reductive procedure, and it was suggested that this losted organic materials combined with reached iron oxides.
Charge characteristics of soil colloids were estimated by applying several species of clay minerals. Montmorillonite had high negative charge constantly in the wide range of pH values, and negative charge of kaolin minera … More ls were pH-independent but it was low. On the other hand, positive and negative charge of allophane were both extremely pH-dependent, pont of zero net charge was observed at pH 5.5.
A casium ion adsorption methods which had been presented in this study was very effective for the investigations on characteristics of cation exchange capacity and point of zero net charge in soil colloids. This new method was able to prevent contaminations during the measurement procedures compared with the previous methods by using sodium or potassium ions.
Determination of particle-size distribution of soils by a laser scattering method was compared with the customary sedimentation method, the high correlation was established between them. This method was useful especially for the observation of continuous distribution of particle size in same clay or soil sample.
An electrokinetic sonic amplitude method should be effective for the estimation of ζ potential of clay minerals and soil colloids because of probability to measure rapidly it in wide rage of pH value. Less

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Itami, K.: "Evaluation of cation exchange capacity of montmorillonite using Casium"Chloride. Clay Science. 10. 469-476 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 栗原宏彰(北川靖夫): "レーザー散乱法による土壌の粒経測定"ペドロジスト. 43. 73-81 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Itami, K.: "Charge characteristics if clays evaluated with caesium chloride"Special neference to dispersion behavior. Clay Science. 11(印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Itami, K. and Tamamura, T.: "Evaluation of cation exchange capacity of montmorillonite using Caesium chloride"Clay Science. 10-6. 469-476 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kurihara H., Kitagawa, Y. and Itami, K.: "Determination of particle-size distribution by a laser scattering method."Pedologist. 42-2. 73-81 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Itami, K., Mori, S. and Kitagawa, Y.: "Charge characteristics of clay evaluated with caesium chloride special reference to dispersion behavior"Clay Science. 10-2 (In press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Itami,K. and Tamamura,T.: "Evaluation of cation exchange capacity of montmoril Conite using"caesium chloride. Clay Science. 10-6. 469-476 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 栗原宏彰,北川靖夫,伊丹勝彦: "レーザー散乱法による土壌の粒径測定"ペドロジスト. 43-2. 73-81 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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