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Effect of Temperature and Moisture on Quinclorac Soil Half-life and Resulting Native Grass and Forb Establishment

Published online by Cambridge University Press:  03 April 2017

Rodney G. Lym
Rodney G. Lym*
Affiliation:
Plant Sciences Department, North Dakota State University, Fargo, ND 58105
*
Corresponding author's E-mail: [email protected]
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Abstract

Quinclorac will control leafy spurge and not injure many established native grasses and forbs. Seeding of desirable species is often required to reestablish native vegetation after an invasive weed-management program, but quinclorac residue may inhibit the reestablishment of native species. Greenhouse studies were conducted to estimate quinclorac dissipation rates in Northern Great Plains soils and the effect of residue on establishment of some native grass and broadleaf plants. Quinclorac 50% dissipation time (DT50) ranged from > 21 to 112 d in four soils from the Northern Great Plains. The quinclorac DT50 was dependent on several factors including soil type, moisture content, temperature, and especially organic matter (OM). Across four different soil textures, quinclorac dissipation generally increased as soil moisture content increased, but moisture had less of an impact in low OM soils. Quinclorac dissipation also increased as temperature increased in the four soils. The most rapid dissipation occurred in soils with higher OM (> 6%), with an average DT50 of < 38 d, at 45% moisture content, held at 16 C. Wild bergamot, purple coneflower, blanketflower, and stiff goldenrod seedling growth were all reduced by quinclorac residue at 6 μg kg−1, the lowest concentration evaluated in the study. The native grass species big bluestem, intermediate wheatgrass, and switchgrass generally were tolerant of quinclorac, but green needlegrass was sensitive, and seedling growth declined as quinclorac residue increased from 6 to 375 μg kg−1. Based on a quinclorac application of 840 kg ha−1 and 150 frost-free d, seeding of sensitive forbs and grasses should be delayed at least 12 mo after herbicide application.

Keywords

Quincloracleafy spurge, Euphorbia esula L.wild bergamot, Monarda fistulosa L.big bluestem, Andropogon gerardii Vitmanblanketflower, Gaillardia aristata Purshgreen needlegrass, Nassella viridula (Trin.) Barkworthintermediate wheatgrass, Thinopyrum intermedium (Host) Barkworth & D.R. Deweypurple coneflower, Echinacea purpurea (L.) Moenchstiff goldenrod, Oligoneuron rigidum (L.) Small var. rigidumswitchgrass, Panicum virgatum L.Dissipationinvasive speciesseeding native speciessoil residual
Type
Research
Information
Invasive Plant Science and Management , Volume 9 , Issue 4 , December 2016 , pp. 252 - 260
Copyright
Copyright © 2016 by the Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Jane M. Mangold, Montana State University.

References

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