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The Effect of Phosphogypsum on Greenhouse Gas Emissions during Cattle Manure Composting

^a Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 - 1st Avenue South, Lethbridge, AB, Canada T1J 4B1
^b Agrium Inc., 11751 River Road, Fort Saskatchewan, AB, Canada T8L 4J1
^c Symbio Ag Consulting, 1703 - 18th Street South, Lethbridge, AB, Canada T1K 2B5

View larger version (28K): [in a new window]   Fig. 1. Change in (a) NH4+ and (b) NO2 + NO3 concentration during composting as affected by phosphogypsum and sand amendments. Treatment terms represent the rate of phosphogypsum (PG) or sand addition at 10, 20, or 30% of manure dry weight and a check treatment (no PG or sand). The vertical bars are standard errors.

View larger version (14K): [in a new window]   Fig. 2. Relationships between (a) total CH4 emission and total sulfur (TS) content and (b) total N2O emission and pH of the final compost.