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Comparison of Site-Specific Management Zones

Soil-Color-Based and Yield-Based

^a Dep. of Soil and Crop Sciences, Colorado State Univ., Fort Collins, CO 80523-1170
^b Dep. of Forestry, Colorado State Univ., Fort Collins, CO 80523-1170

View larger version (32K): [in a new window]   Fig. 1. (a) Soil-color-based management zone technique and (b) yield-based management zone technique for Site Year I. Low productivity = dark gray, medium productivity = light gray, high productivity = white.

View larger version (56K): [in a new window]   Fig. 2. Mean grain yield for the soil-color-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.

View larger version (54K): [in a new window]   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.