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Fig. 3. Nitrogen content in (A) 2000, (B) 2001, and (C) 2002 and C/N ratio in (D) 2000, (E) 2001, and (F) 2002 in belowground biomass of cover crops from 0- to 120-cm soil depth. Weeds denote winter weeds; rye, cereal rye; vetch, hairy vetch; and vetch/rye, hairy vetch–rye biculture. LSD (0.05) denotes least significant difference between cover crops at P $≤$ 0.05.