Regionwide Trials
The foundation of our research continues to be field studies examining the effects of silvicultural treatments applied during stand establishment (e.g., soil tillage, vegetation management, fertilization) and in established stands (e.g., thinning, fertilization, woody vegetation control) on stand growth and nutrition.
Since 1970, FPC members have established over 350 installations of 28 “regionwide” studies in the southeast US, Brazil, Uruguay, Venezuela, Argentina, Chile, and Colombia. Studies are focused on a few important questions that are more effectively answered by members cooperating rather than competing. Most studies examine several silvicultural treatments, providing an opportunity to better understand interactions among treatments. All studies include multiple installations across a range of soil/site types where treatments are replicated at least twice on each site. Data from these studies provide the basis for estimating responses to silvicultural treatments, developing prescription guidelines, and parameterizing growth models.
Use the Regionwide Catalog to access documents and data corresponding to each regionwide study.
Active Regionwide Trials
RW28
Trials: 18
Species: P. taeda
Location: United States
Study Design: Phosphorous Carryover from RW18
RW25
Trials: 8
Species: P. taeda, E. benthamii, E. grandis, E. urograndis
Location: Brazil, Chile, and Colombia
Study Design: Nutrient Omission Study
RW19
Trials: 9
Species: P. taeda
Location: Argentina, United States, and Uruguay
Study Design: Thinning x Fertilization Response
LARW2
Trials: 6
Species: P. radiata, E. grandis, E. grandis x camaldulensis, P. taeda
Location: Argentina and Chile
Study Design: GxExS, Optimization of Value at Harvest Age
RW25
Species: Eucalyptus spp.
Location: Brazil
Study Design: Nutrient omission (Micro and Micro) in Eucalyptus spp.
RW21
Species: Eucalyptus spp.
Location: Colombia and Venezuela
Study Design: Twin-plot network in eucalyptus plantations
RW15
Species: P. taeda, P. radiata
Location: Chile and United States
Study Design: Combinations of N, P, K, and micronutrients in established stands
RW11
Species: P. taeda
Location: United States
Study Design: Thinning intensity and nitrogen application rate study
RW5
Species: P. taeda
Location: United States
Study Design: Thinning x Nitrogen fertilization
RW2
Species: P. taeda
Location: United States
Study Design: Response of loblolly pine to juvenile Nitrogen fertilization
RW27
Trials: 2
Species: E. globulus x nitens
Location: Chile
Study Design: Position and Depth of Fertilizer Application at Planting
RW23
Trials: 5
Species: E. grandis, P. taeda
Location: Brazil and Colombia
Study Design: Intensity and Duration of Vegetation Control
RW7
Trials: 12
Species: P. taeda, P. radiata, P. maximinoi
Location: Argentina, Brazil, and Chile
Study Design: Site Prep x Fertilization x Vegetation Control
Special Study
Trials: 6
Species: P. taeda, E. grandis, Gmelina arborea
Location: Colombia and United States
Study Design: Calcium Application Source and Rate Study
RW1
Species: P. taeda
Location: United States
Study Design: Mid– to Late-Rotation Fertilization
RW20
Trials: 3
Species: P. taeda
Location: Brazil and United States
Study Design: Genetics x Silviculture x Spacing
LARW1
Trials: 3
Species: P. radiata
Location: Chile
Study Design: Long-term Sustainability Study
Completed Regionwide Trials
RW24
Species: Eucalyptus spp.
Location: United States
Study Design: Cold hardy Eucalyptus in the Southeastern United States
RW17
Species: P. taeda, P. elliottii
Location: United States
Study Design: Fertilization x vegetation control factorial at midrotation
RW14
Species: P. taeda
Location: United States
Study Design: Control, 45N, 50P, 100K combinations, and delay and repeat fertilization at establishment
RW9
Species: P. taeda
Location: United States
Study Design: Nitrogen fertilization treatments after thinning
RW4
Species: P. taeda
Location: United States
Study Design: Effectiveness of different rates of Nitrogen
RW26
Trials: 1
Species: E. urograndis
Location: Colombia
Study Design: Dose and Efficiency of Phosphorous Fertilization at Establishment
RW22:
Species: Pinus spp.
Location: United States
Study Design: Twin-plot network in pine plantations
RW16
Species: P. taeda
Location: United States
Study Design: Surface x subsurface tillage factorial at establishment
RW13
Species: P. taeda, P. radiata
Location: Chile and United States
Study Design: Midrotation fertilization with factorial combinations of N and P
RW7
Species: E. benthamii
Location: United States
Study Design: Site Prep x Fertilization x Vegetation Control
RW3
Species: P. taeda
Location: United States
Study Design: Comparison of ammonium nitrate and urea as Nitrogen sources