Conifer release
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Conifer release is a term used in forest management circles to denote selective silvicide and herbicide use, in order to promote conifers at the expense of alternate species. An Oregon State University Extension Service specialist wrote in 2014 that:[1]
On sites recently reforested after a timber harvest, competing plants grow quickly. Competition for essential growth elements—sunlight, moisture, and nutrients—often depresses the vigor and survival of the desired crop trees. Competition comes from grasses, broadleaf weeds (called forbs), shrubs, or less valuable tree species.