Abstract
Abstract Control of woody species based on one-, two-, and three-dimensional expressions of crown size was evaluated in relation to sensitivity to statistical comparison of treatment means and correlation with crop tree growth. The overall mean and coefficient of variation for percent control based on regression-adjusted post-treatment crown height, crown diameter, crown profile, crown area, and crown volume were compared for five common hardwood species in a site-preparation study located in the Georgia piedmont. Estimates of overall mean control were similar among the expressions of crown size, but the estimate was lowest when based on crown diameter and largest when based on crown volume. The coefficient of variation in control was smallest when calculated from crown height and highest when calculated from either crown area or crown volume. Based on orthogonal contrasts, control calculated from crown height and crown diameter tended to be more sensitive to treatment differences than other expressions of crown size. Control calculated from crown volume tended to be the least sensitive to treatment differences, resulting in more conservative orthogonal contrasts. The one- and two-dimensional expressions of crown size had consistently higher correlations with mean size of the crop trees at age 4 than the three-dimensional expression of crown size (crown volume). For. Sci. 37(6):1664-1670.
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