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Ronald E. Stewart Stewart, R. E.; Gross, L. L.; Honkala, B. H. Effects of competing vegetation on forest trees: a bibliography with abstracts. Washington, D.C.: U.S Department of Agriculture, Forest Service; 1984. 1 v. (loose-leaf). ARBOUR, S. J. -0002 1 of 1 FPM8 3-0002 Arbour, Steven J.; Ezel 1 , Andrew W. Effect of mechanical site preparation treatments on height growth of loblolly pine in East Texas sandy soils. In: Barnett, James P., ed. Proceedings of the First Biennial Southern Sil vicul tural Research Conference. 1980 November 6-7; Atlanta, GA. General Technical Report SO34. New Orleans, LA: U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station; 1981: 96-99. Four 10-year-old loblolly pine plantations located within the Willis Geologic Formulation of the Upper Coastal Plain Region were used as sample sites in this study. Plantation selection criteria were: (1) plantations 10 years of age; (2) similar grade of planting stock; (3) 60 percent survival rate; (4) no severe evidence of fire, insect, or disease damage; and (5) plantation site prepared during summer or fall of 1969. The four plantations had received either chop/burn or shear/wi ndrow/burn site preparation and had been machine planted during the 1969-70 planting season. A total of 20 two-acre study sites, 295 feet to a side, were laid out. Within each study site 3 circular 1/20-acre sample plots were established. In addition to other data collected from each plot, two trees were selected for stem analysis to evaluate height growth. Table 1 shows tree height at 11 years. Trees growing on the chop/burn sites averaged 7 percent taller in total height than trees on the shear/wi ndrow/burn sites. Table 1. Effect of mechanical site preparation on growth of loblolly pine after 11 years Chop/Burn Shear/Wi ndrow/Burn (feet) (feet) Plantation 1 Plantation 2 Plantation 3 Plantation 4

Effects of competing vegetation on forest trees : a bibliography with abstracts /