Abstract
In May 1969 the weed vegetation on one plot in a 7-year-old red pine (Pinusresinosa Ait.) plantation was killed with herbicides. The site was a glacial outwash plain in Adams County, Wisconsin. Tree diameter growth was 30% greater on the plot without weeds in the summer of 1969, and 8% greater during the first half of the 1970 growing season. Based on relative height growth of the previous year, weed removal increased height growth by 13% in 1970. Growth differences were attributed to increased available water resulting from weed removal because needle water potentials were lower and stomatal resistances much higher in the presence of weeds during dry conditions in the plantation.
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