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Figure 2


Fig. 2. Corn N uptake (kg N ha–1) in 1990 (2a), 1991 (2b), and 1990–1991 average (2c) after cover crops of: rye killed early (RYP) or late (RYL), vetch killed late (VTL), vetch–rye mixture killed early (MXP) or late (MXL), or no cover (CKL).