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Fig. 3. Mean grain yield for the yield-based management zone technique for each treatment and site year. Treatment 1 = recommended N rate as determined by Mortvedt et al. (1996), Treatment 2 = half the recommended N rate, and Treatment 3 = control treatment. The standard deviation of the mean is represented by error bars. Within each treatment, bars with different letters are statistically different at P 
0.05. *For Site Years I and III, the Treatment 2 experimental strip did not cross the medium zone.
