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A Steady-State Conceptual Nitrogen Model for Estimating Nitrogen Emissions from Cropped Lands¹

ABSTRACT

Details of a conceptual nitrogen model are presented. The model is based upon the principles of mass balance and steady state. It considers both water and N flows into and out of the crop root zone. Illustrative computations are given for estimating steady-state N leaching losses from two corn (Zea mays L.) field sites and comparisons are made with measured values. This model may be applied to other crops or cropping practices.

Key Words: nitrogen leaching losses • nitrogen fertilizer • corn

¹ Joint contribution from the Dep. of Land, Air and Water Resour., Water Sci. and Eng. Sec., Univ. of Calif., Davis, and the Joint FAO/IAEA Div., Vienna, Austria. This study was supported by the Kearney Found. of Soil Sci. and NSF Grant No. GI34733X.

² Lecturer and Associate Water Scientist, Director, Joint FAO/IAEA Div., and Postgraduate Research Water Scientist, respectively. The second author was a Visiting Research Soil Scientist from July 1973 to June 1975. The third author is currently Land and Water Use Analyst, Calif. Regional Water Qual. Control Bd., Central Valley Region.

Received for publication November 18, 1975.

This article has been cited by other articles:

				K. Nakamura, T. Harter, Y. Hirono, H. Horino, and T. Mitsuno Assessment of Root Zone Nitrogen Leaching as Affected by Irrigation and Nutrient Management Practices Vadose Zone J., November 1, 2004; 3(4): 1353 - 1366. [Abstract] [Full Text] [PDF]