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Nitrous Oxide Emissions from a Northern Great Plains Soil as Influenced by Nitrogen Management and Cropping Systems

^a Dep. of Land Resources and Environmental Sciences, Montana State Univ., P.O Box 173120, Bozeman, MT 59717-3120
^b Agriculture and Agri-Food Canada, 51 Campus Drive, Saskatoon, SK S7N 5A8

View larger version (28K): [in this window] [in a new window]   Fig. 1. Cumulative monthly precipitation for the 2-yr study and 40-yr average. Year totals presented in parentheses.

View larger version (13K): [in this window] [in a new window]   Fig. 2. (a.) Nitrous oxide flux vs. time profile and for a dryland perennial grass-alfalfa system, and (b) soil water-filled pore space (WFPS) (± S.E.) and soil temperature 20 mm below surface vs. time.

View larger version (18K): [in this window] [in a new window]   Fig. 3. (a) Nitrous oxide flux vs. time profile and for winter wheat–fallow under conventional tillage and as affected by N fertility (only low and high N regimes presented for clarity) and (b) soil water-filled pore space (WFPS) (mean of N levels ± S.E.) and soil temperature 20 mm below surface vs. time. Downward facing arrows and text indicate date, rate (kg N ha–1), and method of N fertilization. Upward facing arrows indicate tillage events.

View larger version (17K): [in this window] [in a new window]   Fig. 4. (a) Nitrous oxide flux vs. time profile and for winter wheat–fallow under no till and as affected by N fertility (only low and high N regimes presented for clarity, and (b) soil water-filled pore space (WFPS) (mean of N levels ± S.E.) and soil temperature 20 mm below surface vs. time. Downward facing arrows and text indicate date, rate (kg N ha–1), and method of N fertilization.

View larger version (19K): [in this window] [in a new window]   Fig. 5. (a) Nitrous oxide flux vs. time profile and for wheat–wheat under no till and as affected by N fertility (only low and high N regimes presented for clarity), and (b) soil water-filled pore space (WFPS) (mean of N levels ± S.E.) and soil temperature 20 mm below surface vs. time. Downward facing arrows and text indicate date, rate (kg N ha–1), and method of N fertilization.

View larger version (17K): [in this window] [in a new window]   Fig. 6. (a) Nitrous oxide flux vs. time profile and for wheat–pea under no till and as affected by N fertility (only low and high N regimes presented for clarity), and (b) soil water-filled pore space (WFPS) (mean of N levels ± S.E.) and soil temperature 20 mm below surface vs. time. Downward facing arrows and text indicate date, rate (kg N ha–1), and method of N fertilization.