Journal
CROP SCIENCE
Volume 46, Issue 3, Pages 1354-1359Publisher
CROP SCIENCE SOC AMER
DOI: 10.2135/cropsci2005.10-0378
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Although rising atmospheric carbon dioxide (CO2) is known to stimulate the growth of agronomic weeds, the impact of increasing CO2 on herbicide efficacy has not been elucidated for field-grown crops. Genetically modified soybean [Glycine mar (L.) Merr.] (i.e., Round-up Ready soybean) was grown over a 2-yr period at ambient and projected levels of atmospheric carbon dioxide (CO2, 250 mu mol mol(-1) above ambient), with and without application of the herbicide, glyphosate [N-(phosphonomethyl)glycine], to assess the impact of rising atmospheric carbon dioxide concentration [CO2] on chemical efficacy of weed control. For both years, soybean showed a significant vegetative response to elevated [CO2], but no consistent effect on seed yield. For 2003, weed populations for all treatments consisted entirely of C-4 grasses, with no [CO2] effects on weed biomass (unsprayed plots) or glyphosate efficacy (sprayed plots). However, in 2004, weed populations were mixed and included C-3 and C-4 broadleaves as well as C-4 grasses. In this same year, a significant increase in both C-3 broadleaf populations and total weed biomass was observed as a function of [CO2] (unsprayed plots). In addition, a [CO2] by glyphosate interaction was observed with significant C-3 broadleaf weed biomass remaining after glyphosate application. Overall, these data emphasize the potential consequences for CO2-induced changes in weed populations, biomass, and subsequent glyphosate efficacy in Round-up Ready soybean.
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