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Experimental and Model Study of Soil pH

Research Project

Project/Area Number 06453163
Research Category

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

Allocation TypeSingle-year Grants
Research Field Plant nutrition/Soil science
Research InstitutionKyushu University

Principal Investigator

WADA Shinichiro  Kyushu University, Faculty of Engineering, Associate Professor, 農学部, 助教授 (60108678)

Co-Investigator(Kenkyū-buntansha) ITOI Ryuichi  Kyushu University, Faculty of Agriculture, Associate Professor, 工学部, 助教授 (50108768)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1995: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1994: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordspH / Soil / Soil solution / ion exchange / cation adsorption / Anion adsorption
Research Abstract

Although soil chemical and biological properties have been described as a function of soil pH in many soil science studies, soil pH is one of the independent variables which should be predicted from the amounts of materials input to, output from and produced in soil.
In the first of this project, we conducted basic experimental studies on the stoichiometry of cation and anion adsorption on variable charge materials and soils, which is crucial in predicting hydrogen ion activity in soil solution, i.e., soil pH.The 1 : 1 relationship between Ca and Mg adsorption (in mol/kg) on allophanic and humic Andisols and pH-1/2pM revealed that these divalent ions occupy two surface functional groups. The constancy of Na plus Ca adsorption (in mol (+) /kg) on a noncrystalline silica during Ca-Na exchange processes directly showed that Ca occupies two dissociated silanol groups on silica surfaces. Sulfate adsopriton from sodium sulfate and calcium sulfate solutions on a allophanic Andisol was uniquely determined by the pH+1/2pSO4, suggesting that sulfate adsorbs on allophane occupying two protonated surface hydroxyl groups. We also measured carbonate adsorption by allophanic soil and found that the effect of carbon dioxide concentration on it is relatively small.
In the second part, we developed a basic numerical model incorporating cation and anion adsorption by soils and simulated the change in soil solution pH during the dilution of soil solution. The deviation of the predicted pH values increased at higher dilution ratios, but the difference was with in 0.3 pH unit.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] S. -I. Wada, Y. Kakuto, R. Itoi and T. Kai: "Evaluation of calcium dihydrogen phosphate as an extractant for inorganic sulfate applied to soils." Communications in Soil Science and Plant Analysis. 25. 1947-1955 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. -I. Wada and K. Masuda: "Control of salt concentration of soil solution by the addition of synthetic hydrotalcite." Soil Science and Plant Nutrition. 41. 377-381 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 和田信一郎・古村秀麿: "1:5水抽出液の分析に基づく土壌溶液硝酸イオン濃度の推定" 日本土壌肥料学雑誌. 67(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 和田信一郎・兼子明: "塩基飽和度が100%を越える土壌における塩基の存在形態をめぐる問題" 日本土壌肥料学雑誌. 71(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.-I.Wada, Y.Kakuto, and R.Itoi, and T.Kai: "Evaluation of calciumdihydrogen phosphate as an extractant for inorganic sulfate applied to soils." Communications in Soil Science and Plant Analysis. 25. 1497-1955 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.-I.Wada, and K.Masuda: "Control of salt concentration of soil solution by the addition of synthetic hydrotalcite." Soil Science and Plant Nutrition. 41. 377-381 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.-I.Wada, and S.Fumumura: "Predicting nitrate concentration of soil solution from nitrate concentration in 1 : 5 water extract." Japanese Journal of Soil Science and Plant Nutrition. 67, (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.-I.Wada, and A.Kaneko: "Base status of soils having base saturation percentage over 100." Agriculture and Horticulture. 71, (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. -I. Wada, Y. Kakuto, R. Itoi and T. Kai: "Evaluation of calcium dihydrogen phosphate as an extractant for inorganic sulfate applied to soils." Communications in Soil Science and Plant Analysis. 25. 1947-1955 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] S. -I. Wada and K. Masuda: "Control of salt concentration of soil solution by the addition of synthetic hydrotalcite." Soil Science and Plant Nutrition. 41. 377-381 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 和田信一郎・古村秀麿: "1:5水抽出液の分析に基づく土壌溶液硝酸イオン濃度の推定" 日本土壌肥料学雑誌. 67(印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 和田信一郎・兼子明: "塩基飽和度が100%を越える土壌における塩基の存在形態をめぐる問題" 農業および園芸. 71(印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Wada,S.-I and Masuda,K: "Controlling salt concentration in soil solution by synthetic hydrotalcite" Soil Science and Plant Nutrition. 41(印刷中). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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