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Fig. 1. Mean grain yield response (pooling all hybrids) to N treatment (% of recommended fertilizer N) at Brookings and Beresford for 2003 and 2004. Grain yield mean for a particular N treatment with a different letter statistically significant from another N treatment within a particular site-year when analyzed by the Student's t test at the alpha = 0.05 probability level. Dotted line at 10,000 kg ha–1 yield represents the yield goal for which N was applied at the 100% N treatment for all site-years.
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