Crop Science -- Costa et al. 42 (5): 1556 Figure IG6

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Fig. 6. Regression relationships between applied N rates and mean grain yield from data pooled across genotypes and years within sites. Macdonald: GY = 8.62N + 7960.32; r² = 0.99, P < 0.01. Ottawa: GY = -0.143N² + 44.49N + 8654.03; r² = 0.85, P < 0.01.