Crop species composition and richness exert a strong infl uence on soil C and N dynamics through the proportion of decomposable organic compounds returned to the soil. Under no-till, soil C and N pools were compared for fi ve crop rotations, (1) continuous corn (Zea mays L.; CC), (2) spring wheat (Triticum spp.)-soybean [Glycine max (L.) Merr.; SW-S], (3
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