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Nitrogen Transformations During Continuous Leaching¹

ABSTRACT

The simultaneous occurrence of nitrification, denitrification, and N movement was investigated in a soil column during continuous unsaturated leaching. During a continuous application of an NH₄Cl solution, analyses were made of the soil solution with soil depth and time for N as NH₄⁺, NO₂^- and NO₃^-; and of the soil atmosphere for O₂, CO₂, N₂O, and N₂. The use of ¹⁵N permitted direct measurement and quantification of nitrification and denitrification, as well as the transport of N in the liquid and gaseous phases.

Solutions to the appropriate equations using measured reaction rate coefficients, pore-water velocities, and diffusion co-efficients adequately described the steady state NH₄⁺-N and NO₃^--N concentration distribution in the soil profile. Equations were also used to stoichiometrically account for the various interacting species in the N transformations.

¹ Contributions from Dep. of Soils and Plant Nutrition and Water Science and Engineering, Univ. of California, Davis 95616.

² Postgraduate Research Soil Scientist and Professors, Univ. of California, Davis.

Received for publication July 16, 1973. Accepted for publication December 18, 1973.