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Fig. 6. Total basal area (cross-sectional area of all trees) of loblolly pine from plots treated with poultry litter. Plotted are the mean values, by treatment, following the first five growing seasons after litter application. Similar letters (or no letters) among the three treatments indicate no significant treatment effects according to Tukey's test (
= 0.05). Error bars indicate ± one standard error of the mean.
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