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Emissions of N₂O from Alfalfa and Soybean Crops in Eastern Canada

Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada, G1V 2J3

View larger version (16K): [in a new window]   Fig. 1. Daily rainfall during the study at the Harlaka site near Québec City, Canada.

View larger version (30K): [in a new window]   Fig. 2. Soil water-filled pore space (7.5-cm depth) under alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and soybean (Glycine max L.) at the Chapais and Harlaka sites. Arrows indicate alfalfa, timothy, and soybean harvests. Bars represent the LSD (P = 0.05) values for the comparison of crop types at each sampling date; LSD values are only presented when the analysis of variance indicated a significant (P < 0.05) effect of the crop types.

View larger version (29K): [in a new window]   Fig. 3. Soil ammonium content (7.5-cm depth) under alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and soybean (Glycine max L.) at the Chapais and Harlaka sites. Arrows indicate alfalfa, timothy, and soybean harvests. Bars represent the LSD (P = 0.05) values for the comparison of crop types at each sampling date; LSD values are only presented when the analysis of variance indicated a significant (P < 0.05) effect of the crop types.

View larger version (32K): [in a new window]   Fig. 4. Soil nitrate content (7.5-cm depth) under alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and soybean (Glycine max L.) at the Chapais and Harlaka sites. Arrows indicate alfalfa, timothy, and soybean harvests. Bars represent the LSD (P = 0.05) values for the comparison of crop types at each sampling date; LSD values are only presented when the analysis of variance indicated a significant (P < 0.05) effect of the crop types.

View larger version (30K): [in a new window]   Fig. 5. Water-extractable organic carbon (WEOC) (7.5-cm depth) under alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and soybean (Glycine max L.) at the Chapais and Harlaka sites. Arrows indicate alfalfa, timothy, and soybean harvests. Bars represent the LSD (P = 0.05) values for the comparison of crop types at each sampling date; LSD values are only presented when the analysis of variance indicated a significant (P < 0.05) effect of the crop types.

View larger version (28K): [in a new window]   Fig. 6. Nitrous oxide concentration in the soil gas phase (7.5-cm depth) under alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and soybean (Glycine max L.) at the Chapais and Harlaka sites. Arrows indicate alfalfa, timothy, and soybean harvests. Bars represent the LSD (P = 0.05) values for the comparison of crop types at each sampling date; LSD values are only presented when the analysis of variance indicated a significant (P < 0.05) effect of the crop types.

View larger version (28K): [in a new window]   Fig. 7. Soil-surface N2O fluxes under alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and soybean (Glycine max L.) at the Chapais and Harlaka sites. Arrows indicate alfalfa, timothy, and soybean harvests. Bars represent the LSD (P = 0.05) values for the comparison of crop types at each sampling date; LSD values are only presented when the analysis of variance indicated a significant (P < 0.05) effect of the crop types.