Fig. 1.

The effect of various cropping systems on SOC and MAOM-C stock at (A and C) 0- to 15-cm and (B and D) 15- to 30-cm depths. Values are mean ± SEs of four replicates. Values without shared letters indicate significant difference at P < 0.05. Maize, continuous monoculture maize system with annual tillage. MS, no-till maize–soybean rotation. MSW, organically managed maize–soybean–wheat rotation. MAAA, maize–alfalfa–alfalfa–alfalfa rotation. MOA, organic maize–oats/alfalfa/alfalfa rotation. Pasture, rotationally grazed cool-season grass–legume mixtures. More detailed information and the original data can be found in Rui et al. (1).