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Effect of Soil Mositure on Ammonification and Nitrification in Two Northern Plains Soils¹

ABSTRACT

Samples of a Chestnut and Chernozem soil, with and without additions of (NH₄)SO₄ and K₂HPO₄, were incubated at constant water contents ranging from suctions of 0.2 to about 100 bars, and the exchangeable NH₄- and soluble NO₂-N measured periodically. NO₂-N in excess of 1/3 ppm was never detected. Addition of P had no effect on N transformations. Ammonification and nitrification of soil N were almost directly proportional to soil water content at suctions between 0.2 and 15 bars. Measurable ammonification and nitrification occurred at a suction of 15 bars.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA. Presented before Div. S-4, Soil Science Society of America, Nov. 20, 1963, at Denver, Colo.

² Research Soil Scientists, Northern Great Plains Research Center, Mandan, N. Dak.; Plant, Soil and Nutrition Labratory, Ithaca, N.Y., and Fort Collins, Colo. respectively.

Received for publication October 1, 1965. Accepted for publication December 3, 1965.