Loblolly pine seedling performance following herbaceous weed control with hexazinone or imazapyr mixed with sulfometuron on fine-textured soils in SE Arkansas

Williams, R.A.; Yeiser, J.L.; Earl, J.A.

Weed science meets the press Proceedings Southern Weed Science Society 49th annual meeting, Charlotte, North Carolina, USA, January 15, 16, 17, 1996: 122-126

1996


Accession: 002886823

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Abstract
Herbaceous weed control using combinations of sulfometuron (formulated as Oust) mixed with hexazinone (formulated as Velpar L) or imazapyr (formulated as Arsenal AC) and applied over the top of loblolly pine (Pinus taeda) seedlings was performed at 4 sites in SE Arkansas. Two sites were clearcut in 1993 and 2 in 1994. For each year, one site was burned and one site received no preparation prior to planting. Herbicides were applied in March 1995, 2 or 14 months after planting, with a backpack sprayer in a 5-foot band centre over 25 seedling rows of operationally-planted pines. Principal competitors were identified. Initial survival (%), height (cm) and ground-line diameter (mm) were recorded for each seedling during the dormant months of 1994-95, and again 1 growing-season later. After 1 growing season, the height and diameter growth was significantly greater for treated than untreated (control) seedlings at all sites.