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Effect of Nitrogen Volatilization on Soil Acidity Changes Due to Applied Nitrogen¹

ABSTRACT

Nitrogen was applied as urea, NH₄OH, (NH₄)₂SO₄, (NH₄)H₂PO₄, (NH₄)₂HPO₄, NH₄NO₃, and NaNO₃ to 10-, 20-, and 25-g. samples of soil and incubated under conditions favorable for nitrification. Glucose was added during incubation to supply energy for denitrification. The samples were later analyzed for pH, NH₄⁺, NO₂^-, NO₃^-, and organic N. The final acidities and extent of nitrification and volatilization varied considerably, even among identically treated samples. Volatilization losses of N ranged from none to the entire amount applied.

The acidity resulting from nitrification was calculated for each sample and compared to actual acidity. The difference between calculated and observed acidity was accounted for by equivalent N volatilization. This relationship was obtained with 3 soils regardless of the N source applied and the probable gaseous form of loss.

¹ Contribution from the Department of Agronomy and Soils, Agr. Exp. Sta., Auburn University, Auburn, Ala. Presented before Div. III, Soil Science Society of America, Nov. 19, 1959, at Cincinnati, Ohio.

² Associate Soil Microbiologist and Associate Soil Chemist, respectively.

Received for publication May 27, 1959. Accepted for publication September 18, 1959.