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Nitrate Movement with Zero-order Denitrification in a Soil Profile¹

ABSTRACT

A theoretical analysis of the movement of nitrates in an unsaturated soil with zero-order denitrification is presented. The transport equation and boundary conditions are established to represent a field situation (i.e., application of N to the surface of a soil that already has nitrogen present in its profile). An analytical solution is derived. For given values of the diffusivity, pore solute velocity, and the rate coefficients for denitrification, the relative concentration profiles are shown at different times. Comparison with published data is made and it seems that the theoretical relationship fits the data reasonably well.

¹ Contribution from the Dep. of Agricultural Engineering and Dep. of Agronomy, Iowa State University, Ames, IA 50011. Journal paper no. 9924 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project no. 2058.

² Graduate Research Assistant, Associate Professor of Agricultural Engineering, Professor of Agricultural Engineering, and Distinguished Professor of Agronomy and Physics, respectively.

Received for publication December 1, 1978. Accepted for publication May 30, 1980.