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Published in Soil Sci Soc Am J 35:722-725 (1971)
© 1971 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrate Adsorption: I. In Some Acid Soils of Mexico and South America1

T. Kinjo and P. F. Pratt2

ABSTRACT

Nitrate adsorption by subsoils of Andepts, Oxisols, and Alfisols from Mexico and South America was studied using a batch-type technique. Nitrate adsorption increased as the acidity of the suspension increased to about pH 3.5. This increase was directly proportional, but not equivalent, to the amount of hydrogen ion added. The adsorption of NO3- was concentration-dependent and was described by a Langmuir type isotherm when NO3- concentration was above 0.03N for Andepts and above 0.08N for Oxisols and Alfisols. Adsorption maxima and affinity constants of Andepts were twice as large as those of other soils. A significant correlation was observed between the amount of NO3- adsorbed and the content of amorphous inorganic materials extractable with 0.5N NaOH.

NOTES

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 is gratefully acknowledged.

2 Former Graduate Student and 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.






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