The Bugwood Network

Decision-Making Aid for Loblolly and Slash Pine Mid-Rotation Fertilization

Dr. E. David Dickens - Assistant Professor of Forest Productivity, Warnell School of Forest Resources, The University of Georgia

Stand Criteria:

  • Loblolly/slash pine stocking - 400 to 900 TPA (young stand) or 60-90 sq ft BA/ac (< 120 BA/ac)
  • Best trees/best genes present on site?
  • Hardwood stocking < 10% of BA/ac
  • Fusiform rust incidence < 30%
  • Live crown ratio (goes with stocking) >35% to 40%

Soils criteria:

  • Drainage class - very poorly drained to excessively well drained (for flatwoods use CRIFF soil groups for P fertilization at planting)
  • Soil water holding capacity (poor internal drainage or deep sands can present problems)
  • Depth to bedrock, fragipan, or pan (highly eroded or shallow soils to bedrock are problems)
  • Soil texture (% sand, silt, clay)
  • Soil series/group classification

Landowner objectives/ cutting regime:

  • Years to next thinning or final cut (ideal is 6-10 years)
  • Owner finances (how many acres can they afford to fertilize, may need to prioritize stands for fertilization) income from thinning can be used to pay for fertilization

Diagnostic Tool Information:

  • Leaf Area Index (LAI) -done in July-August, if < 3.0 then stand could use N (or N+P)
  • Foliar test - if N or N and P less than 1.2% (N) and 0.10% (P)  for loblolly pine and 0.8-1.2% (N) and 0.08-0.09% (P) for slash pine, then stand could use N or N and P
  • Soil test -P - if P (using double acid extract or Mehlich I procedure) < 8-12 lb/ac, then stand could use P for both loblolly and slash pine

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The University of Georgia - Warnell School of Forestry and Natural Resources and
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Last updated on Friday, May 03, 2002 at 02:34 PM
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