Full TGIF Record # 74787
Item 1 of 1
Publication Type:
Content Type:Abstract or Summary only
Author(s):Hoefer, James A.; Smeda, Reid J.
Author Affiliation:Hoefer: Graduate Research Assistant; and Smeda: Assistant Professor, Department of Agronomy, University of Missouri, Columbia, MO
Title:Response of weed density to glyphosate rate and carrier volume
Section:Soybeans and annual legumes
Other records with the "Soybeans and annual legumes" Section
Meeting Info.:Columbus, OH: December 14-16, 1999
Source:Proceedings of the North Central Weed Science Society. Vol. 55, December 2000, p. 27-28.
# of Pages:2
Publishing Information:Champaign, IL: North Central Weed Science Society
Keywords:TIC Keywords: Weed density; Glyphosate; Application rates; Setaria faberii; Convolvulus; Phytotoxicity; Weed control
Abstract/Contents:"Greenhouse studies were conducted to evaluate the efficacy of glyphosate rate and carrier volume on a mixed stand of weed species at two densities. Giant foxtail, common waterhemp, morningglory species, and velvetleaf were planted into 25 by 53 cm polypropylene flats containing a modified soil mixture. Weeds were thinned to a low density of 50-60 giant foxtail, 4-6 common waterhemp, 3-5 morningglory, and 4-6 velvetleaf plants per flat and a high density of 75-85, 8-10, 7-10, and 8-10 plants per flat, respectively. Glyphosate was applied at 0.105, 0.21, and 0.42 kg ae/ha using three carrier spray volumes of 47, 94, and 188 L/ha when weeds reached 10 to 20 cm in height. Plant fresh weight was determined 21 DAT. The design was a split block with density as the main block and a factorial arrangement of glyphosate rate and carrier volume as the sub-block. The experiment was repeated twice. An increase in glyphosate rate significantly increased control for all weed species at both weed densities. Plant density was only significant as a variable for velvetleaf. At the lowest herbicide rate, reducing carrier volume improved the level of phytotoxicity of glyphosate on giant foxtail and common waterhemp (both sensitive to glyphosate). Acceptable control of morningglory and velvetleaf was not possible with the glyphosate rates used. As a result, these two species were released from competition when giant foxtail and common waterhemp were controlled and grew larger than plants in the untreated control (subjected to interspecific competition). Under our conditions, glyphosate efficacy was rate dependent, and in some instances was affected by carrier colume. However, plant density did not overall influence glyphosate efficacy as suggested on the glyphosate label."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hoefer, J. A., and R. J. Smeda. 2000. Response of weed density to glyphosate rate and carrier volume. Proc. North Cent. Weed Sci. Soc. 55:p. 27-28.
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