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Nitrate Adsorption: III. Desorption Movement and Distribution in Andepts¹

ABSTRACT

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 SO₄^2- and NO₃^- in the same column was to increase the rate of movement of NO₃^-. Sulfate movement was much slower than that of NO₃^-.

¹ Contribution from the Dept. of Soil Science and Agr. Eng., Univ. of Calif., Riverside. Part of a dissertation submitted by the senior author in partial satisfaction of the requirements for a Ph.D. degree in Soil Science. Financial assistance of the National Science Foundation through Grant no. GB 11711 and U.S.A.I.D. Contract Ohio State University-Universidade de Sao Paulo are gratefully acknowledged.

² Former Graduate Student, Professor of Soil Science, and Associate Professor of Soil Science, respectively. The senior author is now a staff member of the Departamento de Solos, Universidade de Sao Paulo, Piracicaba, Sao Paulo, Brasil.

Received for publication January 20, 1971. Accepted for publication June 8, 1971.