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Nitrogen Transformations in Soil During Leaching; I. Theoretical Considerations¹

ABSTRACT

Transport equations describing the movement and simultaneous oxidation of NH₄⁺ to NO₃^- and reduction of NO₃^- to N₂ by microbial and/or chemical means were set up and solved both for leaching of a pulse and for a continuous application of NH₄⁺ and/or NO₃^- salt at the soil surface. Both ionic adsorption owing to cation exchange and microbiological transformations have been considered and distinguished as reversible and irreversible processes, respectively. The possibilities of the model extended to a sequential transformation during transport of more than two nitrogen species have been examined.

¹ Contribution from the Dep. of Water Science and Engineering, Univ. of California, Davis 95616.

² Graduate Student and Professors of Water Science, respectively. The senior author is now Lecturer, Univ. of Agriculture and Technology, Orissa, India.

Received for publication August 6, 1973. Accepted for publication December 10, 1973.