Responses of selected weeds and glyphosate-resistant cotton and soybean to two glyphosate salts

Robert J. Richardson, William A. Bailey, Gregory R. Armel, Cory M. Whaley, Henry P. Wilson, Thomas E. Hines

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Studies were conducted in 2000 and 2001 to investigate responses of glyphosate- resistant cotton, glyphosate-resistant soybean, and selected weed species to postemergence applications of isopropylamine (Ipa) and diammonium (Dia) salts of glyphosate at selected rates ranging from 0.42 to 3.36 kg ae/ha. No differences were detected between either glyphosate salts or application timings for cotton injury, cotton lint yield, micronaire, fiber length, fiber strength, or fiber uniformity. In a weed-free soybean study, no differences in soybean injury occurred between early-postemergence treatments of the two glyphosate salts. Injury from late-postemer- gence treatments did not exceed 12% with glyphosate-Ipa or 9% with glyphosate-Dia at 3.36 kg/ ha. Soybean treated with glyphosate-Ipa yielded 3,050 kg/ha, whereas soybean treated with gly- phosate-Dia yielded 2,880 kg/ha, when averaged over glyphosate rate and application timing. In a soybean study that included weed control as a variable, weed control at 14 d after treatment (DAT), and soybean yield was independent of glyphosate salt. Control of common ragweed, ivyleaf morningglory, pitted morningglory, and large crabgrass at 28 DAT was similar at 0.84 kg/ha of either glyphosate salt.

Original languageEnglish
Pages (from-to)560-564
Number of pages5
JournalWeed Technology
Issue number3
StatePublished - Jul 2003


  • Diammonium
  • Glyphosate formulation
  • Glyphosate salt
  • Isopropylamine

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science


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