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- Title
Early gains from planting large-diameter seedlings and intensive management are additive for loblolly pine.
- Authors
David B. South; James L. Rakestraw; George A. Lowerts
- Abstract
A seedling size/intensive management study with Pinus taeda L. was established in 1993 on two sites in the Coastal Plain of Georgia and South Carolina. Each site contained a 2 × 2 split-plot study involving two seedling sizes and two levels of establishment intensity. Ideotype ``B'' seedlings averaged 5.0 mm in diameter (at the root collar) and were 43 cm tall. Ideotype ``A'' seedlings averaged 8.5 mm in diameter and were 50 cm tall. ``Standard'' establishment practices included herbicides (hexazinone and sulfometuron) and fertilizer (DAP) applied during the first year. The ``intensive'' management involved two herbicide applications during the first year and two during the second year, fertilizer during the first and third years, and insecticide applications during the first two years (for control of tip moth, Rhyacionia frustrana Comstock). Intensive management did not affect survival but planting larger seedlings increased survival slightly on one site. However, treatments affected early growth at both sites. On both sites, fourth-year plot-volumes were increased with greater establishment intensity and larger seedlings but there was no interaction between stock size and establishment intensity. Early growth gains were greatest when both intensive management and larger seedlings were combined. Depending on site, this combination resulted in 21% to 51% more volume (at age 4) than the next best treatment (standard seedlings with intensive management).
- Subjects
LOBLOLLY pine; YELLOW pines; RHYACIONIA; HEXAZINONE
- Publication
New Forests, 2001, Vol 22, Issue 1/2, p97
- ISSN
0169-4286
- Publication type
Article
- DOI
10.1023/A:1012097924355