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Nitrous Oxide Emission from No-Till Irrigated Corn

Temporal Fluctuation and Wheel Traffic Effects

^a Dep. of Agronomy and Horticulture, Univ. of Nebraska, Lincoln, NE 68583
^b Deceased, USDA-ARS, Lincoln, NE

View larger version (70K): [in a new window]   Fig. 1. Schema of plots under a center pivot irrigation system. Each plot represented distinct properties classified based on landscape positions, soils, organic matter, and electrical conductivity.

View larger version (34K): [in a new window]   Fig. 2. (A) Schema of circular chamber location relative to urea ammonium nitrate (UAN) injection zone, and (B) tractor-wheel-tracked and non-wheel-tracked interrows.

View larger version (28K): [in a new window]   Fig. 3. Diurnal pattern of N2O fluxes at various 24-h cycles during corn growing season in 2002. Vertical bars on the soil temperature are the standard error of the means (n = 3) and Dunnett's LSD is for differences between point and continuous daily flux.

View larger version (29K): [in a new window]   Fig. 4. Fluctuation of soil water filled porosity (WFP), soil temperature, and N2O flux for each yearly cycle of urea ammonium nitrate (UAN) injection under a no-till irrigated continuous corn. Vertical bars are standard errors of the means (n = 6) at each sampling day.

View larger version (29K): [in a new window]   Fig. 5. Fluctuation of soil nitrate and ammonium concentrations at the injection zone and 0.23 m from the injection zone, and N2O fluxes within 140 d after urea ammonium nitrate (UAN) injection in 2003. Vertical bars are the standard errors of the N2O means (n = 6) at each sampling day.

View larger version (27K): [in a new window]   Fig. 6. Fluctuation of soil ammonium and soil nitrate concentrations of composite soil samples and N2O fluxes for each yearly cycle of urea ammonium nitrate (UAN) injection. Vertical bars are the standard errors of the means (n = 6) at each sampling day.