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This article in SSSAJ

  1. Vol. 35 No. 5, p. 728-732
    Received: Jan 20, 1971
    Accepted: June 8, 1971

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Nitrate Adsorption: III. Desorption Movement and Distribution in Andepts1

  1. T. Kinjo,
  2. P. F. Pratt and
  3. A. L. Page2



A peak of NO3- accumulation occurred in the 1- to 2-cm depth of an 11-cm soil column when 0.2 meq of KNO3 was applied in sufficient solution (16 ml) to fill the pore space in a column of air-dry San Gregorio soil. Practically no NO3- was found below the 4-cm depth. The greater portion of the NO3- applied was displaced from the soil column by the addition of 3 pore volumes of water. The anion distribution coefficient obtained from a column of San Gregorio soil was 2.2 ml/g and was similar to that obtained from a batch-type method when the soil was in equilibrium with the same concentration of NO3-. The rate of NO3- desorption was described by a first-order reaction equation. The effect of adding SO42- and NO3- in the same column was to increase the rate of movement of NO3-. Sulfate movement was much slower than that of NO3-.

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