Early survival and growth of loblolly pine seedlings treated with sulfometuron or hexazinone plus sulfometuron in southwest Arkansas

Yeiser, J.; Rhodenbaugh, E.

Tree planters' notes 45(4): 116-120

1994


Accession: 002807481

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Abstract
Improved survival and growth of pine (Pinus spp.) seedlings have been observed as a result of herbaceous weed control with sulfometuron, hexazinone, or combinations of the two herbicides. In this study, survival and growth of planted loblolly pine (Pinus taeda L.) seedlings were assessed two growing seasons after treatment with seven selected rates of hexazinone (1.12, 0.84, 0.75, 0.56, 0.37, 0.28, and 0 kg ai/ha) mixed with 0.10 kg ai/ha sulfometuron and compared to values for untreated (control) seedlings. Treatment with hexazinone-sulfometuron mixtures resulted in greater height and diameter growth than treatment with sulfometuron alone. All seven herbicide treatments resulted in improved survival and increased growth compared to values for untreated seedlings two growing seasons after treatment. Height and diameter growth were greatest with 0.84 kg ai/ha hexazinone mixed with 0.10 kg ai/ha sulfometuron. However, increasing the rate of hexazinone above 0.56 kg ai/ha did not substantially increase growth, indicating that 0.56 kg ai/ha hexazinone plus 0.10 kg/ha sulfometuron may be the best choice operationally.