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Weed Seed Viability in Composted Beef Cattle Feedlot Manure

Agriculture and Agri-Food Canada, Research Centre, 5403 1st Avenue S., Lethbridge, Alberta, Canada T1J 4B1

View larger version (52K): [in a new window]   Fig. 1. Effect of windrow location on temperature during composting in (a) 1997 and (b) 1999. Triangle symbols on the x axes represent turning dates.

View larger version (28K): [in a new window]   Fig. 2. Effect of windrow location on cumulative degree days (CDD) during composting in (a) 1997 and (b) 1999. Within dates, location means with the same letter are not significantly different (P = 0.05).

View larger version (25K): [in a new window]   Fig. 3. Windrow water content (a) during composting in 1997 and 1999 and (b) as affected by windrow location in 1999.

View larger version (20K): [in a new window]   Fig. 4. Effect of windrow location on weed seed viability (average of 13 weed species) in 1999.

View larger version (30K): [in a new window]   Fig. 5. Relationship between days of composting and weed seed viability for (a) green foxtail, (b) redroot pigweed, (c) wild buckwheat, and (d) wild oat in 1997 and 1999.

View larger version (26K): [in a new window]   Fig. 6. Relationship between cumulative degree days (CDD) and viability of wild buckwheat seed in 1997 and 1999. Viability expressed as percent of control samples.