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Reducing Weed Seed Rain with Late-Season Glyphosate Applications

Published online by Cambridge University Press:  20 January 2017

Chad E. Brewer  and
Lawrence R. Oliver
Chad E. Brewer*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, 115 Plant Science Building, University of Arkansas, Fayetteville, AR 72701
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil, and Environmental Sciences, 115 Plant Science Building, University of Arkansas, Fayetteville, AR 72701
*
Corresponding author's E-mail: cbrewer@uark.edu.
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Abstract

Field trials were established in Fayetteville, AR, to determine the effects of glyphosate on biomass and seed production of spurred anoda, entireleaf morningglory, hemp sesbania, and Florida pusley. Inconsistent control of these species by glyphosate allows them to enrich the soil seedbank. Glyphosate rates of 0.42, 0.84, and 1.68 kg ae/ha were applied at 3, 6, and 9 wk after emergence (WAE) and were compared with a nonsprayed control. Spurred anoda seed production was reduced 99.9% by glyphosate at 1.68 kg/ha averaged over application timings and 99.7% by glyphosate applied at 6 WAE averaged over rates. Entireleaf morningglory seed production was reduced 100% by glyphosate at 1.68 kg/ha at 3 WAE and > 93% by the same rate applied at 6 or 9 WAE. Hemp sesbania seed production was reduced 100% by glyphosate at 1.68 kg/ha at 3 WAE and > 96% by glyphosate at 0.42, 0.84, and 1.68 kg/ha applied at 6 or 9 WAE. Florida pusley seed production was reduced 99.9% by glyphosate at 1.68 kg/ha averaged over application timings and 99.4% by application at 3 or 6 WAE averaged over rates. Biomass accumulation for all species was reduced most by early applications, particularly at 1.68 kg/ha.

Keywords

Glyphosateentireleaf morningglory, Ipomoea hederacea var. integriuscula (L.) Jacq. A. Gray IPOHGFlorida pusley, Richardia scabra L. RCHSChemp sesbania, Sesbania exaltata (Raf.) Cory SEBEXspurred anoda, Anoda cristata(L.) Schlecht ANVCRSeed productionseedbankspecies shift
Type
Research
Information
Weed Technology , Volume 21 , Issue 3 , September 2007 , pp. 753 - 758
Copyright
Copyright © Weed Science Society of America 

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