Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-26T15:14:40.689Z Has data issue: false hasContentIssue false
  • English
  • Français

Preharvest Effects of Applying Glyphosate to Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

W. R. Azlin  and
C. G. McWhorter
W. R. Azlin
Affiliation:
South. Weed Sci. Lab., Sci. Ed. Admin., Agric. Res., U.S. Dep. Agric., Stoneveille, MS 38776
C. G. McWhorter
Affiliation:
South. Weed Sci. Lab., Sci. Ed. Admin., Agric. Res., U.S. Dep. Agric., Stoneveille, MS 38776
Get access Rights & Permissions [Opens in a new window]

Abstract

Over a 4-yr period, glyphosate [N-(phosphonomethyl)glycine] was applied over-the-top to soybeans [Glycine max (L.) Merr.] at five rates, from 0.56 to 3.36 kg/ha, at four periods of time prior to harvest, 23 to 29 days, 15 to 21 days, 7 to 12 days, and 1 to 4 days. Soybean yields were reduced when glyphosate was applied at 2.24 and 3.36 kg/ha 23 to 29 days before harvest. Soybean seed were discolored following all five rates of glyphosate applied 23 to 29 days before harvest, following glyphosate at 1.12 to 3.36 kg/ha applied 15 to 21 days before harvest, and following glyphosate at 3.36 kg/ha applied 7 to 12 days before harvest. Germination of soybean seed was reduced at 30 C only when glyphosate was applied at 2.24 and 3.36 kg/ha 23 to 29 days before harvest, or at 3.36 kg/ha applied 15 to 21 days before harvest. At alternating temperatures (10.6 C for 72 h followed by 30 C for 72 h), all treatments applied 23 to 29 days before harvest reduced soybean seed germination; glyphosate at 1.12, 1.68, and 3.36 kg/ha applied 15 to 21 days before harvest also reduced germination. Seed from plots treated with glyphosate 23 to 29 or 15 to 21 days before harvest produced atypical soybean plants. Glyphosate at 2.24 and 3.36 kg/ha applied 23 to 29 days before harvest reduced the oil content in soybean seed, but none of the treatments consistently affected the protein content.

Keywords

Seed qualityseed germinationweed controldesiccationSorghum halepense
Type
Research Article
Information
Weed Science , Volume 29 , Issue 1 , January 1981 , pp. 123 - 127
Copyright
Copyright © 1981 by the Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Assad, A. C. and Romans, F. E. 1979. Chemical harvest aid assumes important role in six crops. Weeds Today 10:20–21.Google Scholar
2. Connell, J. T. and Jeffery, L. S. 1977. Johnsongrass control systems in no-till soybeans. Proc. South. Weed Sci. Soc. 30:75–80.Google Scholar
3. Davis, H. E., Fawcett, R. S., and Harvey, R. G. 1979. Effects of frost and maturity on glyphosate phytotoxicity, uptake, and translocation. Weed Sci. 27:110–114.CrossRefGoogle Scholar
4. Egley, G. H. and Williams, R. D. 1978. Glyphosate and paraquat effects on weed seed germination and seedling emergence. Weed Sci. 26:249–251.CrossRefGoogle Scholar
5. Kells, J. J. and Rieck, C. E. 1979. Effects of illuminance and time on accumulation of glyphosate in johnsongrass (Sorghum halepense . Weed Sci. 27:235–237.CrossRefGoogle Scholar
6. McWhorter, C. G. and Azlin, W. R. 1978. Effect of environment on the toxicity of glyphosate to johnsongrass (Sorghum halepense) and soybeans (Glycine max . Weed Sci. 26:605–608.CrossRefGoogle Scholar
7. McWhorter, C. G., Jordan, T. N., and Wills, G. D. 1980. Translocation of 14C-glyphosate in soybeans (Glycine max) and johnsongrass (Sorghum halepense . Weed Sci. 28:113–118.CrossRefGoogle Scholar
8. Parochetti, J. V., Wilson, H. P., and Burt, G. W. 1975. Activity of glyphosate on johnsongrass. Weed Sci. 23:395–400.CrossRefGoogle Scholar
9. Richardson, J. T. and Frans, R. E. 1977. Johnsongrass control in soybeans after three years of herbicide application. Proc. South. Weed Sci. Soc. 30:73.Google Scholar
10. Whigham, D. K. and Stoller, E. W. 1979. Soybean desiccation by paraquat, glyphosate, and ametryn to accelerate harvest. Agron. J. 71:630–633.CrossRefGoogle Scholar