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Nitric Oxide Volatilization from a Calcareous Soil and Model Aqueous Solutions¹

ABSTRACT

Nitric oxide (NO) was volatilized from a laboratory aerobically incubated West Point loam (amended with different rates of urea or ammonium sulfate nitrogen) and from aqueous solutions containing ammonium and nitrate ions. Oxide loss from the soil was dependent upon the source and rate of nitrogen applied. Urea-treated soil samples fertilized with 50, 100, 200, and 300 ppm of N lost 8.9, 17.8, 26.6, and 35.5 kg N/ha, respectively. Similar NO losses were observed from ammonium sulfate treatments, although these were substantially smaller. Also, losses of NO from sterile soil samples supplemented with ammonium and nitrite in concentrations equivalent to those occurring in the nonsterile soil at the peak of oxide volatilization were comparable to those of the nonsterile soil. Aqueous solutions containing nitrite and ammonium or urea nitrogen, with or without ferrous iron, humic acid, or lignin, which were buffered from pH 6.5 to pH 8.0, volatilized appreciable quantities of NO over the entire pH range tested. A decrease in methyl content of organic matter suggests that methyl nitrite may have been volatilized.

¹ Contribution from the Dept. of Agronomy-Soils, Mississippi State Univ., State College, Miss. Presented in part before Div. S-3 Soil Sci. Soc. Amer., New Orleans, La., Nov. 10–15, 1968. This work was supported in part by Southern Regional Research Project S-51, and USDA, Hatch Funds.

² Former Graduate Assistant, now at Dept. of Agron., Univ. of Kentucky, and Professor of Agronomy, Mississippi State Univ., respectively.

Received for publication June 29, 1970. Accepted for publication December 21, 1970.