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Biomass Response of Loblolly Pine to Selected Cultural Treatments¹

ABSTRACT

The effects of site preparation and other cultural treatments on the biomass of 1- and 2-year-old loblolly pine (Pinus taeda L.) seedlings were examined. Treatments included various combinations of disking, applying herbicides, fertilizing, subsoiling, fumigating the soil, irrigating, and mowing. Oven-dry weights of stems, needles, roots, and branches were determined. Root collar diameter was significantly affected by treatment after both 1 and 2 growing seasons and was as effective an indicator of treatment response as other variables singly or in combination.

¹ Contribution from International Paper Co., Southlands Experiment Forest, Bainbridge, GA 31717, and North Carolina State Univ., Raleigh, NC 27650. This research was supported in part by the North Carolina State Forest Fertilization Cooperative, N. C. State Univ., Raleigh, when the senior author was NCSFFC Research Assistant. Paper no. 5826 of the Journal Series, N. C. Agric. Exp. Stn. Presented before Div. S-7, Soil Sci. Soc. of Am., 14 Nov. 1977, in Los Angeles, Calif.

² Project Leader, Forest Soils Research, Bainbridge, GA, and Professor, Department of Forestry, N. C. State Univ.

Received for publication November 22, 1978. Accepted for publication May 14, 1979.