Nitrous oxide evolution from irrigated land
Nitrous oxide (N/sub 2/O) fluxes from irrigated land cropped to vegetables in a coastal valley in California ranged from 0.0038 to 1.06 kg N/ha per day. For all sites, maximum fluxes (0.24 to 1.06 kg N/ha per day) were observed during the first post-fertilization irrigation and were followed by a trend to lower values (0.048 to 0.144 kg N/ha per day) towards the end of cropping despite total fertilizer N inputs of 176 to 528 kg N/ha. The N/sub 2/O flux showed a pronounced dependence on irrigation events with maximum fluxes associated with soil-moisture contents between 18 and 22% and soil-water suctions between 75 and 150 mbars. The magnitude of N/sub 2/O flux during periods of high moisture content appeared to depend primarily upon soil nitrate concentration which declined during the cropping cycle. Data for N/sub 2/O flux, soil moisture content, air-filled porosity, and soil-water suction suggested that denitrification rather than nitrification was the major process involved in N/sub 2/O production at each field site. Mean N/sub 2/O fluxes for each site coupled with soil-water suction data for a 12-month period suggested annual emissions of N/sub 2/O ranging from 19.6 to 41.8 kg N/ha.
- Research Organization:
- Univ. of California, Riverside
- OSTI ID:
- 5158757
- Journal Information:
- J. Environ. Qual.; (United States), Journal Name: J. Environ. Qual.; (United States) Vol. 9:3; ISSN JEVQA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AERATION
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DENITRIFICATION
ELEMENTS
FARMS
FERTILIZERS
FLUIDS
FOOD
IRRIGATION
MOISTURE
NITRATES
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POROSITY
SOILS
SYNTHESIS
VEGETABLES