Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-02T21:33:04.107Z Has data issue: false hasContentIssue false

Benefits of Soil-Applied Herbicides in Glyphosate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Jeffrey M. Ellis
Affiliation:
Department of Agronomy, Louisiana State University Agricultural Center, 104 Sturgis Hall, Baton Rouge, LA 70803
James. L. Griffin*
Affiliation:
Department of Agronomy, Louisiana State University Agricultural Center, 104 Sturgis Hall, Baton Rouge, LA 70803
*
Corresponding author's E-mail: [email protected]

Abstract

Field research conducted over 3 yr evaluated the utility of preemergence (PRE), soil-applied herbicides at half- and full-label rates in glyphosate-resistant soybean. Soil-applied herbicide treatments at full-label rates included pendimethalin plus imazaquin (0.84 + 0.14 kg ai/ha), pendimethalin (1.12 kg/ha), metolachlor (1.68 kg ai/ha), dimethenamid plus imazaquin (1.0 + 0.14 kg ai/ha), sulfentrazone plus chlorimuron (0.22 + 0.04 kg ai/ha), and metribuzin plus chlorimuron (0.36 + 0.06 kg ai/ha). Weed density and growth were reduced when PRE herbicides were used, and in many cases for broadleaf weeds, half-label rates were as effective as full rates. None of the herbicides provided complete control of all weeds. Sulfentrazone plus chlorimuron reduced ivyleaf morningglory density an average of 90%. For hemp sesbania, metribuzin plus chlorimuron reduced weed emergence over 3 yr at least 95%. The initial glyphosate application was made when the largest weeds, barnyardgrass or hemp sesbania, reached 10 cm. In 1998 all soil-applied herbicide treatments extended the time period of glyphosate application by 3 to 5 d when compared with the nontreated control. In 1999 the full rate of metribuzin plus chlorimuron delayed the application of glyphosate by 6 d, and an extension of 7 d was noted for the full rates of sulfentrazone or metribuzin plus chlorimuron in 2000. When soil-applied herbicides were used each year, only a single application of glyphosate was needed. A second glyphosate application was needed in only 1 yr when soil-applied herbicides were not used. Even though differences in weed control were observed among the herbicide treatments, soybean yield was the same.

Type
Research
Copyright
Copyright © 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

Anonymous. 1999. Louisiana Summary. Louisiana Cooperative Extension Service Publ. 2382. pp. 813.Google Scholar
Anonymous. 2000. Louisiana Suggested Chemical Weed Control Guide. Louisiana Cooperative Extension Service Publ. 1565 p.Google Scholar
Askew, S. D., Shaw, D. R., and Street, J. E. 1998. Red rice (Oryza sativa) control and seedhead reduction with glyphosate. Weed Technol. 12: 504506.CrossRefGoogle Scholar
Bradshaw, L. D., Padgette, S. R., Kimball, S. L., and Wells, B. H. 1997. Perspective on glyphosate resistance. Weed Technol. 11: 189198.Google Scholar
Burnside, O. C. 1992. Rationale for developing herbicide-resistant crops. Weed Technol. 6: 621625.CrossRefGoogle Scholar
Corrigan, K. A. and Harvey, R. G. 2000. Glyphosate with and without residual herbicides in no-till glyphosate-resistant soybean (Glycine max). Weed Technol. 14: 569577.CrossRefGoogle Scholar
Culpepper, A. S. and York, A. C. 1998. Weed management in glyphosate-tolerant cotton. J. Cotton Sci. 4: 174185.Google Scholar
Holloway, J. C. Jr. and Shaw, D. R. 1995. Influence of soil-applied herbicides on ivyleaf morningglory (Ipomoea hederacea) growth and development in soybean (Glycine max). Weed Sci. 43: 655659.Google Scholar
Holloway, J. C. Jr. and Shaw, D. R. 1996. Effect of herbicides on ivyleaf morningglory (Ipomoea hederacea) interference in soybean (Glycine max). Weed Sci. 44: 860864.Google Scholar
Jordan, D. L., York, A. C., Griffin, J. L., Clay, P. A., Vidrine, P. R., and Reynolds, D. B. 1997. Influence of application variables on efficacy of glyphosate. Weed Technol. 11: 354362.CrossRefGoogle Scholar
Krausz, R. F., Kapusta, G., and Matthews, J. L. 1996. Control of annual weeds with glyphosate. Weed Technol. 10: 957962.Google Scholar
McKinley, T. L., Roberts, R. K., Hayes, R. M., and English, B. C. 1999. Economic comparison of herbicides for johnsongrass (Sorghum halepense) control in glyphosate-tolerant soybean (Glycine max). Weed Technol. 13: 3036.Google Scholar
McWhorter, C. G. and Sciumbato, G. L. 1988. Effects of row spacing, benomyl, and duration of sicklepod (Cassia obtusifolia) interference on soybean (Glycine max) yields. Weed Sci. 36: 254259.Google Scholar
Mosier, D. G. and Oliver, L. R. 1995. Common cocklebur (Xanthium strumarium) and entireleaf morningglory (Ipomoea hederacea var. integriuscula) interference on soybeans (Glycine max). Weed Technol. 43: 239246.CrossRefGoogle Scholar
Muyonga, K. C., DeFelice, M. S., and Sims, B. D. 1996. Weed control with reduced rates of four soil applied soybean herbicides. Weed Sci. 44: 148155.Google Scholar
Shaw, D. R., Wixson, M. B., and Smith, C. A. 1991. Effect of imazaquin and chlorimuron plus metribuzin on sicklepod (Cassia obtusifolia) interference in soybean (Glycine max). Weed Technol. 5: 206210.Google Scholar
Vangessel, M. J., Ayeni, A. O., and Majek, B. A. 2000. Optimum glyphosate timing with or without residual herbicides in glyphosate-resistant soybean (Glycine max) under full-season conventional tillage. Weed Technol. 14: 140149.CrossRefGoogle Scholar