Soil Based Assesment of Site Productivity for Loblolly and Slash Pine Plantations in the Coastal Plain Region
Applied Research
Richard Evans
County Extension Agent
University of Georgia
Garden City
Abstract
Southern pine plantations are a vital component of the southeastern U.S. forestry industry, contributing significantly to both revenue and employment. In Georgia, the forest industry generated $42 billion in revenue and supported 140,787 jobs in 2024. Loblolly pine (Pinus taeda) and slash pine (Pinus elliottii) are the most important commercial species in the region. Traditionally, productivity assessments have relied on outdated models based on site index (SI) and mean annual increment (MAI). In response to evolving forest management practices, the Natural Resources Conservation Service has collaborated with the University of Georgia Warnell School of Forestry & Natural Resources to update these models for loblolly and slash pine plantations in the Coastal Plain region. The study reveals that loblolly pine is best suited for high-productivity soils, while slash pine thrives on soils without an argillic horizon, possibly with a spodic horizon. Updated SI models offer practical tools for forest managers and landowners to assess site potential and optimize plantation productivity. Performance of both species was similar on certain poorly drained soils, highlighting the importance of soil testing for phosphorus levels and drainage class before plantation establishment. Intensive management should prioritize loblolly pine, while slash pine remains a viable alternative for wetter, poorly drained sites. These predictive models present a cost-effective approach to improving site selection, ensuring maximum timber yields, and advancing sustainable forest management practices.
Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.
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Authors: Richard Evans, Blake Carter
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Evans, R. County Extension Agent, University of Georgia, Georgia, 31408
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Carter, B. County Extension Agent, University of Georgia, Georgia, 31329