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Fig. 4. Effect of cover crops on (A) biomass yield, (B) C concentration, (C) N concentration, (D) C accumulation, (E) N accumulation, and (F) C/N ratio of sorghum roots from the 0- to 120-cm depth in 2001. R denotes rye; V, hairy vetch; VR, hairy vetch and rye biculture; and WW, winter weeds. LSD(0.05) is the least significant difference between treatments at P = 0.05.