Skip to main content Accessibility help
×
Home

Factors Affecting the Toxicity of MON 37500 Residues to Following Crops

  • James R. Moyer (a1) and William M. Hamman (a2)

Abstract

MON 37500 was registered in 1999 for weed control in wheat and has the potential to injure following crops. Therefore, growth chamber experiments were conducted to determine the effect of soil properties on the phytotoxicity of MON 37500 residues, the relative tolerance of several potential rotational crops, and the joint effect of MON 37500 residues plus other herbicide residues on a susceptible crop. In 13 Alberta soils, the concentrations of MON 37500 and triasulfuron that reduced canola and barley dry matter by 50% (GR50) were correlated with soil organic matter (OM) and pH. The relationship that best described the effect of soil organic matter on GR50 for each herbicide–crop combination was GR50 = a + b(OM)2. There was no significant improvement in r 2 when pH and clay content were included in the equation. For soils with 2 and 10% OM content, predicted GR50 values for canola in MON 37500–treated soil are 2 and 26 ηg/g soil, respectively. Little injury to following canola is predicted in soils with OM contents > 4.5%. At similar concentrations, following crops such as canola, flax, lentil, and oriental mustard are predicted to be injured less by MON 37500 than by triasulfuron. The effect of combined residues of MON 37500 with triasulfuron, imazethapyr, or metsulfuron should be additive.

Copyright

Corresponding author

Corresponding author's E-mail: moyer@em.agr.ca.

References

Hide All
Amundson, R. G., Trask, J., and Pendall, E. 1988. A rapid method of soil carbonate analysis using gas chromatography. Soil Sci. Soc. Am. J. 52: 880883.
Anonymous. 2000. Crop Protection with Chemicals. Agdex 606-1. Edmonton, AB, Canada: Alberta Agriculture, Food and Rural Development. 462 p.
Beyer, E. M. Jr., Duffy, M. J., Hay, J. V., and Schlueter, D. D. 1988. Sulfonylureas. In Kearney, P. C. and Kaufman, D. D., eds. Herbicides: Chemistry, Degradation, and Mode of Action. Volume 3. New York: Marcel-Dekker. pp. 117187.
Colby, S. R. 1967. Calculating synergistic and antagonistic responses of herbicide combinations. Weed Sci. 15: 2022.
Friesen, G. H. and Wall, D. A. 1991. Residual effects of CGA-131036 and chlorsulfuron on spring-sown rotational crops. Weed Sci. 39: 280283.
Gonese, J. U. and Weber, J. B. 1998. Herbicide rate recommendations: soil parameter equations vs. registered rate recommendations. Weed Technol. 12: 235242.
Hance, R. J. 1984. Herbicide residues in the soil: some aspects of their behaviour and agricultural significance. Aust. Weeds 3: 2634.
Moyer, J. R. 1995. Sulfonylurea herbicide effects on following crops. Weed Technol. 9: 373379.
Moyer, J. R. and Boswall, A. L. 1997. Effects of MON-37500 residues on rotational crops 11 months after application at Lethbridge Alberta. Saskatoon, SK: Expert Committee on Weeds Research Report. 279 p.
Moyer, J. R. and Esau, R. 1996. Imidazolinone herbicide effects on following rotational crops in southern Alberta. Weed Technol. 10: 100106.
Nicholls, P. H. and Evans, A. A. 1991. Sorption of ionizable organic compounds by field soils. Part I. Acids. Pestic. Sci. 33: 319330.
[SAS] Statistical Analysis Systems. 1999a. SAS/Stat User's Guide, Version 8. Cary, NC: Statistical Analysis Systems Institute. 3,884 p.
[SAS] Statistical Analysis Systems. 1999b. SAS Procedures Guide, Version 8. Cary, NC: Statistical Analysis Systems Institute. 1,643 p.
Seefeldt, S. S., Jensen, J. E., and Fuerst, E. P. 1995. Log-logistic analysis of herbicide dose response relationships. Weed Technol. 9: 218227.
Shinn, S. L., Thill, D. C., Price, W. J., and Ball, D. A. 1998. Response of downy brome (Bromus tectorum) and rotational crops to MON 37500. Weed Technol. 12: 690698.
Soil Classification Working Group. 1998. The Canadian system of soil classification. 3rd ed. Ottawa, ON: Agriculture and Agri-Food Canada Research Branch Publ. Ottawa, ON646. 187 p.
Soil Survey Staff. 1999. Soil taxonomy. A basic system of soil classification for making and interpreting soil surveys. 2nd ed. Washington, DC: USDA. Handbook 436. 869 pp.
[WSSA] Weed Science Society of America. 1994. Herbicide Handbook 7th ed. Lawrence, KS: Weed Science Society of America. pp. 287289.
[WSSA] Weed Science Society of America. 1998. Herbicide Handbook. Supplement to 7th ed. Lawrence, KS: Weed Science Society of America. pp. 4951.

Keywords

Factors Affecting the Toxicity of MON 37500 Residues to Following Crops

  • James R. Moyer (a1) and William M. Hamman (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed