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Nitrifying Organisms Affected by Climatic Region in Western United States¹

ABSTRACT

Nitrification of ammoniacal (NH₄⁺) N added as (NH₄)₂SO₄ to different soils of western USA and incubated at 20, 25, 35 and 40C with moisture at 0.3 bar moisture tension was investigated. In all soils from northern regions, nitrification was faster at 20 and 25C than at 35 and 40C. The reverse was true in the case of the southern soils which nitrified fastest at 35C. Nitrites accumulated in larger quantities under the temperature conditions less favorable for nitrification.

¹ Approved by the Director, Utah Agr. Exp. Sta., as Journal Paper No. 474. This work was supported in part by Western Regional Research Funds, W-31.

² Research Assistant, Professor, and Research Associate, respectively, Department of Soils and Meteorology, Utah State University, Logan, Utah.

Received for publication June 16, 1965. Accepted for publication July 27, 1965.