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Effect of Salts and Salts Plus Nitrogen-15-Labeled Ammonium Chloride on Mineralization of Soil Nitrogen, Nitrification, and Immobilization¹

ABSTRACT

The effects of 0.0, 0.01, 0.1, and 1.0M concentrations of sodium, copper and calcium chloride salts added to a Pima clay loam with and without ¹⁵NH₄Cl on mineralization of soil nitrogen, nitrification, and immobilization were measured over a 49-day period. Dilute concentrations of salt, ¹⁵NH₄Cl, and dilute salts plus ¹⁵NH₄Cl stimulated mineralization of soil N. The "priming effect" was shown to be real and not just a simple exchange. Nitrification of native ammonium nitrogen and ¹⁵N-labeled ammonium decreased with increasing concentrations of salt. High concentrations of copper and calcium chloride salts inhibited nitrification of ¹⁵N-labeled ammonium more than sodium salts. Immobilization of ¹⁵NH₄⁺-N was decreased significantly by high concentrations of salt. Gaseous loss processes were decreased with increased salts.

¹ Contribution from Dep. of Soils, Water and Eng., Arizona Agr. Exp. Sta. Tucson, Arizona 85721. Published with approval of the Director as Journal Article no. 2167.

² Assistant Professor and Professor, Dep. of Soils, Water and Eng., Univ. of Arizona, respectively.

Received for publication August 20, 1973. Accepted for publication March 29, 1974.