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- W55952497 abstract "Denitrification in laboratory soil columns and a cropped field plot maintained near water saturation was determined from direct measurement of N 2 and N 2 O gases within the soil after applying nitrate enriched with 15 N. Gas-concentration gradients and measured soil gas-diffusion coefficients were used to calculate fluxes of 15 N 2 and 15 N 2 O from the soil surface. Residual soil N, plant uptake, and leaching were measured in order to calculate denitrification by difference. For the laboratory columns, the amount of denitrification determined directly agreed closely with that determined by difference. For the field plot, the amounts of denitrification determined from gas fluxes and by difference was respectively 45 and 57% of the N applied. The flux of 15 N 2 at the surface of the field profile was 16 times the flux of 15 N 2 O. Statistical analyses of the uncertainties associated with measurements of each of the parameters for calculating denitrification demonstrated considerable uncertainty in both the direct and difference methods. The greatest uncertainty in the direct method arose from the variability in measuring gas-concentration gradients within the soil profile. Uncertainties in determining denitrification by difference resulted primarily from sampling variability of the residual soil N and leaching components of the N balance." @default.
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- W55952497 date "1978-01-01" @default.
- W55952497 modified "2023-09-27" @default.
- W55952497 title "APPLICATION OF GASEOUS-DIFFUSION THEORY TO MEASUREMENT OF DENITRIFICATION" @default.
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- W55952497 doi "https://doi.org/10.1016/b978-0-12-518401-4.50025-0" @default.
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