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Aluminum chemistry of nonallophanic Andosols

Research Project

Project/Area Number 08660081
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Plant nutrition/Soil science
Research InstitutionAkita Prefectural College of Agriculture

Principal Investigator

TAKAHASHI Tadashi  Akita Prefectural College of Agriculture, Department of Agriculture, Associate Professor, 農学科, 助教授 (80132009)

Co-Investigator(Kenkyū-buntansha) SATO Atsushi  Akita Prefectural College of Agriculture, Department of Agriculture, Professor, 農学科, 教授 (90073965)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsvolcanic ash soils / active Al / aluminum solubility / nonallophanic Andosols / Al-humus complexes / exchangeable Al / Andisols
Research Abstract

The aim of this study is to expand upon previous investigations about aluminum chemistry by examining aluminum solubility and release rates in soils dominated by Alhumus complexes. Aluminum solubility relationships over the pH range 3-5 were determined in a 30-d equilibration study. Aluminum release rates were measured using a stirred, flow-through reaction vessel with 10^<-3> M acetate buffer adjusted to pH 3.5, 4.0 and 4.5 for pretreated soil samples with Na-pyrophosphate, acid oxalate and KCl solutions.
The nonallophanic Andosol samples displayed pAl versus pH slopes of 2.0-2.4 and solubilities considerably lower than those of common Al(OH)_3 phases. The soil samples showed very rapid Al release rates. The Al release rates were greatly dependent on the pH and ion strength of extracting solution. Pyrophosphate treatment reduced Al release rates to very low levels indicating that Al-humus complexes were the primary source of dissolved Al.
Some non-allophanic soils showed that the aluminum release rates and the total amount of Al released from KCl-treated residues were greater than or nearly identical with those of non-treated soil samples. Thus, the amount of 1M KCl-extractable Al does not always reflect the amount of exchangeable Al in soils dominated by Al-humus complexes.
This study and the literature showed that the amount of KCl-extractable Al is closely related to the amount of organically complexed Al. These data indicates that the dynamics of aluminum in nonallophanic Andosols is largely influenced by the exchange of Al ions with humic substances.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 高橋正・R.Dahlgren,: "Possible control of aluminum solubility by 1M KCl treatment in some soils dominated by aluminum-humus complexes" Soil Science and Plant Nutrition. 44. 43-51 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tadashi Takahashi and Randy Dahlgren: "Possible control of aluminum solubility by 1M KCl treatment in some soils dominated by aluminum-humus complexes" Soil Science and Plant Nutrition. Vol.44. 43-51 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 高橋正,R.Dahlgren: "Possible control of aluminum solubility by 1M KCl treatment in some soils dominated by aluminum-humus complexes" Soil Science and Plant Nutrition. 44・1. 43-51 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 高橋正: "Possible control of aluminum solubillity by 1M KCl treatment in some soils dominated by aluminum-humus complexes" Soil Science and Plant Nutrition. 44・1. 43-51 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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