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Effects of Freeze–Thaw and Soil Structure on Nitrous Oxide Produced in a Clay Soil

Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada G1V 2J3

View larger version (26K): [in a new window]   Fig. 1 Effect of thawing and agriculture practices on denitrifying rate (DR) in soil slurries of conventional till continuous barley (CT–C) and no-tillage–barley–red clover rotation (NT–R) treatments. Agricultural practices and freeze treatments indicate significant differences (P < 0.0005 and 0.05); interaction between treatments was not significant. Vertical bars represent standard error of four replicates

View larger version (28K): [in a new window]   Fig. 2 Effect of freezing on denitrification rates in 0.25- to 2- and 2- to 5-mm macroaggregate fractions from continuous barley under conventional till (CT–C) and a barley–red clover rotation under no-till (NT–R) management systems

View larger version (45K): [in a new window]   Fig. 3 Effect of freezing–thawing cycle and agricultural practices on N2O and CO2 emissions in undisturbed soil cores under aerobic (ambient air) and anaerobic (N2 + 10% C2H2, v/v) incubations