Abstract
AbstractThe 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.
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