Abstract
Abstract Douglas-fir (Pseudotsuga menziesii) container-grown plug (1-0) and nursery-grown bareroot (2-0) seedlings were planted in southwest Oregon beneath sclerophyll hardwoods injected with triclopyr amine or left untreated. Sixty percent of the hardwood canopy was killed by injection. Seedlings beneath treated hardwoods experienced greater daytime moisture stress but lower predawn moisture stress. Plugs grew more in the first year than bareroots. Five-year survival averaged 100% and 96% for plugs and bareroots under treated hardwoods, 83% and 73% under untreated hardwoods. Herbicide injection of hardwoods was associated with increased height, diameter, and volume growth rates in the underplanted Douglas-fir and seems necessary for establishing Douglas-fir in this environment. West. J. Appl. For. 5(3):86-89, July 1990.
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