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This article in SSSAJ

  1. Vol. 41 No. 6, p. 1171-1175
    Received: Oct 18, 1976
    Accepted: July 20, 1977

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Estimation of the Amount of Amorphous Materials for Characterizing Andosols1

  1. Kanji Kawai2



An estimation method of amorphous inorganic materials in soils for characterizing andosols and tentative criteria for classification of andosols was proposed. Organic matter-free fine earth is treated with 0.2N oxalic acid solution at 40°C for 6 hours under about 10,000 lux by a fluorescent lamp. The amounts of extracted silica, aluminum, and iron are highly correlated with values determined by the alternate dissolution method using hydrochloric acid and sodium hydroxide solutions.

Andepts have more than 50% of amorphous inorganic materials in the clay fraction as determined by the pipette method after treated by ultrasonic vibration. The soils, derived from volcanic ash and/or volcanic ash influenced or redeposited, containing < 50% of amorphous inorganic materials in the clay fraction and < 20% on an ovendry basis, are included in Andeptic subgroups.

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