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Effect of Added Salts on Nitrogen Mineralization in Three California Soils¹

ABSTRACT

The effect of ammonium sulfate, ammonium chloride, potassium chloride, calcium chloride, aluminum chloride, and copper sulfate added in amounts corresponding to 0.2, 2, and 20 atm concentration on mineralization of soil nitrogen in three soils was measured over a 30-day period. Significant increases were produced by the ammonium salts which were labeled with ¹⁵N to allow distinction between added and soil nitrogen. In Aiken clay loam nitrogen mineralization was also increased by solutions of potassium chloride, calcium chloride, and aluminum chloride, but in Altamont clay loam and Mormon clay increases were not consistent. Copper sulfate depressed nitrogen mineralization in all soils. It was found that the quantity of organic nitrogen brought into solution was related to the concentration of the salt solution.

¹ Contribution from the Department of Soils & Plant Nutrition, Univ. of California, Davis.

² Professor of Soil Microbiology and Laboratory Technician, respectively.

Received for publication October 26, 1970. Accepted for publication January 4, 1971.