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Modeling the Effects of Fertilizer Application Rate on Nitrous Oxide Emissions

^a Dep. of Renewable Resources, Univ. of Alberta, Edmonton, AB, Canada T6G 2E3
^b Agric. and Agri-Food Canada Research Branch, Ottawa, ON, Canada K1A 0C6
^c Conservation and Development, Alberta Agric. and Rural Development, Edmonton, AB, Canada T6H 5T6
^d Crop Diversification Centre North, Alberta Agric. and Rural Development, Edmonton, AB, Canada T6H 5Z2

View larger version (46K): [in a new window]   Fig. 1. (A) Precipitation measured, (B) 10-cm soil water content () modeled, and (C) 10-cm soil temperature measured (symbols) and modeled (line) at Ottawa during 2000. Vertical lines indicate period of N2O emissions shown in Fig. 2.

View larger version (40K): [in a new window]   Fig. 2. N2O fluxes measured (symbols) and modeled (lines) at Ottawa during (a) DOY 186– 195, (b) DOY 196–205, and (c) DOY 206–215 in 2000 following anhydrous NH3 applications of 15.5 and 9.4 g N m–2 on DOY 187.

View larger version (43K): [in a new window]   Fig. 3. N2O fluxes measured (symbols) and modeled (lines) at Ellerslie during June and early July in (a) 2001 and (b) 2003 following spring urea applications of 9 and 18 g N m–2.

View larger version (28K): [in a new window]   Fig. 4. Changes in (b) soil organic N (SON), (c) mineral N (NH4+ + NO3–), and (d) N2O emissions modeled under (a) variable precipitation during 25 yr of urea application at 9 and 18 g N m–2 yr–1.