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Tillage Effects on Carbon Fluxes in Continuous Wheat and Fallow–Wheat Rotations

^a New Zealand Institute for Crop & Food Research Limited, Private Bag 4704, Christchurch, New Zealand
^b Semiarid Prairie Agricultural Research Centre, Agriculture and Agri-Food Canada, Swift Current, SK, Canada S9H 3X2
^c Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada K1A 0C6

View larger version (25K): [in a new window]   Fig. 1 Daily precipitation in 1995 and 1996, measured at a meteorological station 0.5 km from the field site at the Semiarid Prairie Agricultural Research Centre, Swift Current, Saskatchewan, Canada

View larger version (21K): [in a new window]   Fig. 2 Effect of tillage on fluxes of CO2 from continuous wheat (Cont. W), cropped phase of a fallow–wheat rotation [F–(W)], and fallow phase of a fallow–wheat rotation [(F)–W] in 1995. Measurement dates when tillage or tillage x rotation effects were significant (P < 0.10) are denoted by "+". CT is conventional tillage; NT is no-till. Arrows indicate dates of tillage operations in the CT treatment

View larger version (22K): [in a new window]   Fig. 3 Effect of tillage on fluxes of CO2 from continuous wheat (Cont. W), cropped phase of a fallow–wheat rotation [F–(W)], and fallow phase of a fallow–wheat rotation [(F)–W] in 1996. Measurement dates when tillage or tillage x rotation effects were significant (P < 0.10) are denoted by "+". CT is conventional tillage; NT is no-till. Arrows indicate dates of tillage operations in the CT treatment

View larger version (20K): [in a new window]   Fig. 4 Fluxes of CO2 from no-till (NT) soil vs. those from conventional till (CT) soil under continuous wheat (Cont. W), cropped phase of a fallow–wheat rotation [F–(W)], and fallow phase of a fallow–wheat rotation [(F)–W] (data for 1995 and 1996 are pooled)

View larger version (19K): [in a new window]   Fig. 5 Effect of tillage on C in surface residues (measured in fall) in continuous wheat (Cont. W), cropped phase of a fallow–wheat rotation [F–(W)], and fallow phase of a fallow–wheat rotation [(F)–W]. CT is conventional tillage; NT is no-till