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Soil Carbon and Nitrogen Dynamics Following Application of Pig Slurry for the 19th Consecutive Year

I. Carbon Dioxide Fluxes and Microbial Biomass Carbon

^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 Einstein St., Sainte-Foy, QC, Canada, G1P 3W8

View larger version (26K): [in a new window]   Fig. 1 Temporal variations of (a) soil temperature at a depth of 10 cm for maize soils amended with mineral fertilizer (control) and pig slurry at 60 (PS60) and 120 Mg ha-1 (PS120) and (b) soil moisture at depths of 5, 10, 20, and 40 cm averaged across treatments

View larger version (14K): [in a new window]   Fig. 2 Temporal variations of CO2 flux from maize soils amended with mineral fertilizer (control) and pig slurry at 60 (PS60) and 120 Mg ha-1 (PS120). Mineral fertilizer was applied on 29 May and pig slurry on 30 June 1997

View larger version (12K): [in a new window]   Fig. 3 Slurry-induced CO2–C losses from maize soils amended with pig slurry at 60 (PS60) and 120 Mg ha-1 (PS120). Pig slurry was applied on 30 June 1997

View larger version (17K): [in a new window]   Fig. 4 Temporal variations of soil microbial biomass C for maize soils amended with mineral fertilizer (control) and pig slurry at 60 (PS60) and 120 Mg ha-1 (PS120). Mineral fertilizer was applied on 29 May and pig slurry on 30 June 1997

View larger version (17K): [in a new window]   Fig. 5 Temporal variations of extractable C for maize soils amended with mineral fertilizer (control), and pig slurry at 60 (PS60) and 120 Mg ha-1 (PS120). Mineral fertilizer was applied on 29 May and pig slurry on 30 June 1997

View larger version (12K): [in a new window]   Fig. 6 Temporal variations of specific activity of soil microbial biomass for maize soils amended with mineral fertilizer (control) and pig slurry at 60 (PS60) and 120 Mg ha-1 (PS120). Mineral fertilizer was applied on 29 May and pig slurry on 30 June 1997. MBC is microbial biomass C