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Soil Organic Carbon after Twelve Years of Various Crop Rotations in an Aridic Boroll

^a Symbio Ag Consulting, Lethbridge, AB, Canada, T1K 2B5
^b Agriculture and Agri-Food Canada, Lethbridge, AB, Canada, T1J 4B1
^c Alberta Agriculture and Food, Lethbridge, AB, Canada, T1J 4C7

View larger version (31K): [in this window] [in a new window]   Fig. 1. First 6-yr (1992–1997) vs. second 6-yr (1998–2003) effects of rotation and fertilizer treatment on (a) average rotation yield (grain or hay averaged over both cropped and noncropped phases), (b) SOC, and (c) light fraction C. Error bars are standard errors.

View larger version (16K): [in this window] [in a new window]   Fig. 2. Difference in light and heavy fraction C to 7.5 cm after 12 yr between selected treatments (upper named treatment less lower named treatment, for example, Wall- FWall). Percentages are the proportion of the total difference accounted for by the difference in light fraction C.