Nitrogen Transformations During Continuous Leaching1
- J. L. Starr,
- F. E. Broadbent and
- D. R. Nielsen2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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