. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Conifer Yields Increase After Weeds Are Controlled Dramatic gains in stem volume of Douglas-fir and ponderosa pine fol- lowing use of chemicals to control weeds at the time of planting are reported by scientists at the Pacific Northwest Station. Seven herbicides and two combinations of herbicides were sprayed, using a backpack sprayer, on grasses and forbs competing with trees. Benefits just discernible at 3 years after planting were increasing rapidly by the end of the sixth yea
. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. Conifer Yields Increase After Weeds Are Controlled Dramatic gains in stem volume of Douglas-fir and ponderosa pine fol- lowing use of chemicals to control weeds at the time of planting are reported by scientists at the Pacific Northwest Station. Seven herbicides and two combinations of herbicides were sprayed, using a backpack sprayer, on grasses and forbs competing with trees. Benefits just discernible at 3 years after planting were increasing rapidly by the end of the sixth year. Volume increases on sprayed areas ranged from 349 to 650 percent higher than on areas that did not have the one-time applica- tion of chemicals. Especially effective for reducing competition from weeds were hexazinone and a mixture of dalapon and atrazine. The research was conducted in the Wenatchee National Forest in eastern Washington. Young conifers in that area must compete successfully with established herbaceous plants that rapidly deplete available soil moisture to critical levels when summer drought starts. Control of grasses and forbs, either before or during planting, is usu- ally essential for survival and growth of trees. Few herbicides are registered in forestry for controlling grasses and forbs, however, and fewer still are really effective. Demonstration and publication of the research showing the effectiveness of the two herbicides have led to widespread interest by for- est managers. They plan to use these herbicides for preparing planting sites to get better conifer growth and reduce mortality from competition and moisture Unless these dense grasses and weeds are controlled they will use up the soil moisture needed by young conifers to survive on this logged Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perf
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