Abstract
The temporal change of soil organic-carbon (Corg) was studied in soil samples taken from long-term crop rotations at Lethbridge. Between 1910 and 1990, net Corg losses for the 0–15 cm depth varied between 23% under fallow–wheat (FW) and 21% under fallow–wheat–wheat (FWW) and 17% under continuous wheat (W). Analysis of variance and an LSD test indicated that in 1990 the surface Corg concentrations were similar among all crop rotations. Corg in the 15–30 cm depth decreased over time and was significantly lower than in surface samples. Key words: Organic carbon, dry combustion, cold-wet dichromate digestion
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