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Published in Soil Sci Soc Am J 20:357-360 (1956)
© 1956 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Temperature on Nitrification in Soils1

Burns R. Sabey, W. V. Bartholomew, Robert Shaw and John Pesek2

ABSTRACT

Nitrification of ammonium sulfate as influenced by temperature was studied in 3 Iowa soils in the laboratory and in 1 soil under field conditions over a fall and winter season. Laboratory temperatures ranged from 8° to 30° C. and soil temperature in the field varied from freezing to about 20° C.

General relationships were established between temperatures and nitrification rates in given soils. Nitrification rate decreased with diminution in soil temperature; however, the relationship was not linear over the entire temperature range. At given temperatures, ammonia oxidation rates differed between soils studied, but the temperature-nitrification rate curves for the 3 soils were similar and differed only by a constant factor.

Of particular importance to this study was the influence exerted on nitrification by temperature as it decreased from optimum to critically low temperatures. Complete inhibition was not attained until soil temperatures approached the freezing point. Only slight oxidation of ammonium occurred, however, under field conditions in soils that were fertilized after soil temperatures had decreased below 50° F.

NOTES

1 Journal paper No. J-2841 of the Iowa Agr. Exp. Sta., Ames, Iowa. Project 965. Contribution of the Agronomy Department. Presented before Div. III, Soil Science Society of America, St. Paul, Minn., November, 1954.

2 Graduate Assistant, Professor of Soils, Associate Professor of Climatology, and Associate Professor of Soils, respectively.

Received for publication December 15, 1954.




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