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Greenhouse Gas Emissions during Cattle Feedlot Manure Composting

Agriculture and Agri-Food Canada, Lethbridge Research Centre, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1

View larger version (28K): [in a new window]   Fig. 1. Mean daily (a) air temperature, (b) wind speed, and (c) precipitation during the composting period, May–August 1997

View larger version (91K): [in a new window]   Fig. 2. Temperature profiles during (a) passive and (b) active composting (for active aeration treatment, on days where there are two temperature readings, the first ones were obtained 1 to 2 h before the windrows were turned and the second ones (i.e., t14, t21, t29, t50, t70, and t84) were obtained immediately after turning)

View larger version (85K): [in a new window]   Fig. 3. Concentration profiles of O2, CO2, CH4, and N2O during passive aeration composting

View larger version (28K): [in a new window]   Fig. 4. Greenhouse gas emissions and O2 consumption during passive composting, (a) daily flux and (b) cumulative flux (based on the surface area at the start of composting)

View larger version (100K): [in a new window]   Fig. 5. Concentration profiles of O2, CO2, CH4, and N2O during active aeration composting [on days where there are two data points, the first ones were obtained 1 to 2 h before the windrows were turned and the second ones (i.e., t14, t21, t29, t50, t70, and t84) were obtained immediately after turning]

View larger version (31K): [in a new window]   Fig. 6. Greenhouse gas emissions and O2 consumption during active composting, (a) daily flux and (b) cumulative flux (based on the surface area at the start of composting; arrows denote dates of windrow turning)