Simulation of denitrification losses of nitrate fertilizer applied to uncropped, cropped, and manure-amended field plots

Journal Article · Sun Apr 01 04:00:00 EST 1984 · Soil Sci.; (United States)

DOI:https://doi.org/10.1097/00010694-198404000-00009· OSTI ID:5910676

Rolston, D E; Rao, P S.C.; Davidson, J M; Jessup, R E

Losses of nitrate fertilizer via denitrification were simulated using a mathematical model that included transport and plant uptake of water and nitrogen in soil. The denitrification rate was considered to be a function of nitrate concentration, water-extractable organic carbon concentration, degree of soil-water saturation, and temperature. Water-extractable organic carbon concentrations were calculated from initial amounts of soil carbon and additions of plant residues or animal manure. It was assumed that the consumption of added carbon in the soil system would occur in two or three stages and different rate coefficients were assigned for each stage and carbon source. A Q/sub 10/ value of 2 was used in correcting the rate coefficients for denitrification were compared with measured N/sub 2/ and N/sub 2/O gas fluxes at the soil surface during nitrate leaching in field plots of Yolo soil maintained at different soil-water content and soil temperatures and that received various carbon additions and irrigation frequencies. Reasonable agreement was found between measured rates and total amounts of denitrification and those calculated by the model using a single denitrification rate coefficient for all cropped field plots and another rate coefficient for all uncropped field plots. 32 references, 6 figures, 3 tables.

• Research Organization: Univ. of California, Davis
• OSTI ID: 5910676
• Journal Information: Soil Sci.; (United States), Journal Name: Soil Sci.; (United States) Vol. 137:4; ISSN SOSCA
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CARBON
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DENITRIFICATION
DIFFUSION
DISSOLUTION
ELEMENTS
ENVIRONMENTAL TRANSPORT
EXPERIMENTAL DATA
FERTILIZERS
FIELD TESTS
INFORMATION
LEACHING
MASS TRANSFER
MATHEMATICAL MODELS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SIMULATION
SOILS
TESTING
THEORETICAL DATA
UPTAKE