Singly applied herbicides for site preparation and release of loblolly pine in central Georgia

摘要

Separate studies were installed to evaluate site-preparation and release herbicide treatments for loblolly pine (Pinus taeda L.). Tests were at four locations each on the Piedmont and Coastal Plain of central Georgia. Six herbicide treatments were tested for pre-planting site preparation and seven treatments were applied In the third growing season for over-the-top release, both with untreated checks. Most herbicides were applied at maximum labeled rates. Six years after site preparation, per-acrepine volumes differed significantly (p=O.05) among treatments as follows: Velpar~(R) = Pronone~(R) > Tordon~(R) = Roundup~(R) > Garlon~(R) = Banvel~(R) > check. Four full growing seasons after release, Arsenal~(R) and Pronone treatments produced greatervolumes than Roundup and check treatments and greater than all other treatments after 5 years. Because some release treatments grew less pine volume than the checks, proper release prescriptions appear more critical than site-preparation prescriptions.