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Nitrification in Soil: Systems Approaching a Steady State¹

ABSTRACT

Equations are set up for the consecutive reactions NH₄⁺ NO₂^- NO₃^- in an idealized soil column and solved, for an open system with a constant rate of entry of a solution of ammonium, for concentrations of ions as functions of time of flow and distance within the column. The equations take into account growth of nitrifying organisms but it is assumed that diffusion and ion exchange within the soil and fixation of nutrients by the nitrifiers are of secondary importance.

Contribution from the Department of Soils & Plant Nutrition, University of California, Berkeley. Supported in part by National Aeronautic and Space Administration Grant NGL-05-003-079.

² Professor of Soil Biochemistry.

Received for publication December 18, 1968. Accepted for publication April 10, 1969.