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Published in Soil Sci Soc Am J 26:238-242 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrification as Affected by Temperature and Moisture Content of Mulched Soils1

D. T. Parker and W. E. Larson2

ABSTRACT

In the temperature range of 16° to 20°C., a 2°C. differential in soil temperature had a measurable effect on the rate of conversion of NH4-N to NO3-N. However, as soil temperature increased to the range of 25° to 30°C. or as the supply of NH4-N became limiting, differences in NO3-N production resulting from small differences in soil temperature were not observed. In field soil, very early in the season when soil temperature was in the range of 16° to 20°C., mulched soil was 1° to 2°C. cooler than bare soil. During this period greater accumulation of NO3-N could occur in bare than in mulched soil as a result of the temperature difference.

As measured in the laboratory, NO3-N production was retarded at soil moisture tensions below 50 cm. of water. At still higher moisture levels, considerable mineral N was lost from the soil. Measurements in the field showed that the soil moisture content of mulched soil exceeded that of bare soil. For short periods of time the moisture level of mulched soil was high enough to cause retarded nitrification and loss of N.

NOTES

1 Contribution from the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Iowa Agr. Home Econ. Exp. Sta. Journal Paper No. J-3662 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Project No. 787.

2 Soil Scientists, USDA, Ames, Iowa. The junior author is also Professor of Soils, Agronomy Department, Iowa State University.

Received for publication July 3, 1961. Accepted for publication September 11, 1961.






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