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Published in Soil Sci Soc Am J 41:265-271 (1977)
© 1977 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Modeling Nitrate Movement and Dissipation in Fertilized Soils1

K. E. Saxton, G. E. Schuman and R. E. Burwell2

ABSTRACT

It is important to know the fate of nitrogen (N) fertilizers to ensure crop production and avoid pollution, but frequent measurement of soil N is difficult. Therefore, we developed a digital model to calculate the occurrence, movement, and dissipation of nitrate-nitrogen (NO3-N) within the soil profile of fertilized agricultural lands. Daily NO3-N amounts and distributions within a 1.8-m soil profile were calculated by representing the major processes influencing NO3-N for the entire year. Daily soil moisture amounts and movement were predicted by a previously developed soil moisture-evapotranspiration model.

Profiles of NO3-N measured periodically on two research watersheds in western Iowa, one normally fertilized (168 kg/ha per year) and the other excessively fertilized (448 kg/ha per year) with N were used for model verification. The daily calculations for the fertilized cornfields (Zea mays L.) with moderately permeable soils included NO3-N movement, dissipation, and profile leaching. The predicted NO3-N profiles closely represented those measured.

NOTES

1 Contribution from the Watershed Research Unit, North Central Region, ARS-USDA, in cooperation with the Iowa, Nebraska and Missouri Agric. Exp. Stn., Ames, Iowa; Lincoln, Nebraska; and Columbia, Missouri. Published as paper no. 4084, J. Ser. Nebraska Agric. Exp. Stn.

2 Hydraulic Engineer, ARS-USDA, Columbia, Missouri; Soil Scientist, ARS-USDA, Cheyenne, Wyoming; and Soil Scientist, ARS-USDA, Columbia, Missouri, respectively. Senior author is now at ARS-USDA, 215 Johnson Hall, Washington State Univ., Pullman, WA 99163.

Received for publication February 2, 1976. Accepted for publication November 15, 1976.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1977 by the Soil Science Society of America.