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Carbon Dioxide and Nitrous Oxide Emissions following Fall and Spring Applications of Pig Slurry to an Agricultural Soil

^a Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada, G1V 2J3
^b Institut de Recherche et de Développement en Agroenvironnement, Complexe Scientifique, 2700 rue Einstein, Sainte-Foy, QC, Canada, G1P 3W8

View larger version (35K): [in a new window]   Fig. 1. Temporal variations of (a) soil water-filled pore space at 15 cm and daily rainfall; (b) soil air O2 and CO2 concentration at 15 cm; (c) soil temperature and N2O concentration at 15 cm; (d) soil-surface N2O flux from a loam soil cropped to maize and amended with ammonium nitrate fertilizer (NH4–NO3), and pig slurry applied in the fall (fall slurry) or in the spring (spring slurry). Fall application of slurry was made on 13 Oct. 1998, and ammonium nitrate and spring slurry were applied on 17 May 1999. Error bars represent the LSD (P = 0.05) for treatment comparison at each date.

View larger version (35K): [in a new window]   Fig. 2. Temporal variations of (a) soil NH+4–N (0–12 cm); (b) soil NO–3–N (0–12 cm), and (c) cumulated N2O emissions for a loam soil cropped to maize and amended with ammonium nitrate fertilizer (NH4–NO3), and pig slurry applied in the fall (fall slurry) or in the spring (spring slurry). Fall application of slurry was made on 13 Oct. 1998, and ammonium nitrate and spring slurry were applied on 17 May 1999. Error bars represent the LSD (P = 0.05) for treatment comparison at each date.

View larger version (33K): [in a new window]   Fig. 3. Temporal variations of (a) microbial biomass C (0–12 cm); (b) soil K2SO4–extractable C (0–12 cm), (c) soil-surface CO2 flux, and (d) cumulated CO2 emissions at day of year (DOY) 174 (23 June 1999) for a loam soil cropped to maize and amended with ammonium nitrate fertilizer (NH4–NO3), and pig slurry applied in the fall (fall slurry) or in the spring (spring slurry). Fall application of slurry was made on 13 Oct. 1998, and ammonium nitrate and spring slurry were applied on 17 May 1999. Error bars represent the LSD (P = 0.05) for treatment comparison at each date.

View larger version (39K): [in a new window]   Fig. 4. Relationships between soil-surface N2O emissions, soil nitrate (0–12 cm) and soil water-filled pore spaces (0–15 cm) in a loam soil following fall and spring application of pig slurry. Fall application of slurry was made on 13 Oct. 1998, and ammonium nitrate and spring slurry were applied on 17 May 1999.