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Published in Soil Sci Soc Am J 33:276-278 (1969)
© 1969 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Formation of Nitrate from Ammonium Nitrogen in Soils: IV. Use of the Delay and Maximum Rate Phases for Making Quantitative Predictions1

B. R. Sabey, L. R. Frederick and W. V. Bartholomew2

ABSTRACT

Estimation of the amount of nitrate accumulation occurring in soil requires an understanding of the delay period and maximum rate of nitrate accumulation under defined environmental conditions. The actual maximum rates and delay periods of nitrate accumulation varied greatly between soils at several constant temperatures, whereas the relative maximum rates and delay periods were more nearly constant at any one temperature.

An equation for estimating nitrate accumulation, which includes maximum rate and delay indexes, is suggested. Temperature-rate and temperature-delay indexes are presented for several soils. Values for different temperatures were predicted from actual values determined at only one temperature. The concept of delay periods and maximum rates should help evaluate the influence of other factors on nitrate accumulation.

NOTES

1 Journal Paper no. J5973 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. Project 1378. Contribution from the Department of Agronomy (Soils).

2 Associate Professor, Professor, and Professor of Agronomy (Soils), respectively. The authors are now at the University of Illinois, Iowa State University, and North Carolina State University, respectively.

Received for publication June 5, 1968. Accepted for publication September 12, 1968.






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Copyright © 1969 by the Soil Science Society of America.