Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-27T05:29:56.505Z Has data issue: false hasContentIssue false
  • English
  • Français

Johnsongrass (Sorghum Halepense) Control and Economics of Using Glyphosate-resistant Soybean in Fallowed Sugarcane Fields

Published online by Cambridge University Press:  20 January 2017

James L. Griffin ,
Donnie K. Miller  and
Michael E. Salassi
James L. Griffin
Affiliation:
Department of Agronomy and Environmental Management, Louisiana State University AgCenter, 104 Sturgis Hall., Baton Rouge, LA 70803
Donnie K. Miller*
Affiliation:
Northeast Research Station, Louisiana State University AgCenter, P.O. Box 438, St. Joseph, LA 71366
Michael E. Salassi
Affiliation:
Department of Agricultural Economics and Agribusiness, Louisiana State University AgCenter, 101 Agricultural Administration, Baton Rouge, LA 70803
*
Corresponding author's E-mail: [email protected].
Get access Rights & Permissions [Opens in a new window]

Abstract

Johnsongrass control in fallowed sugarcane fields was evaluated with glyphosate and the graminicides quizalofop, fluazifop, and clethodim applied in soybean compared with nonsoybean tillage and glyphosate programs. Glyphosate was applied to glyphosate-resistant soybean as a single early postemergence (EPOST) treatment around 30 d after planting (DAP) at rates of 840, 1,120, or 2,240 g ai/ha; as sequential treatments EPOST and late postemergence (LPOST) around 60 DAP at 560 followed by (fb) 560 or 1,120 fb 1,120 g/ha; or as a single LPOST treatment at 2,240 g/ha. Quizalofop at 77 g ai/ha, fluazifop at 420 g ai/ha, and clethodim at 280 g ai/ha were also evaluated as single EPOST treatments. In 1996 johnsongrass control 7 d after EPOST treatment (DAT) was at least 90% for glyphosate treatments but control was 73 to 77% for the graminicides. In 1997 johnsongrass control 7 DAT was at least 82% for all herbicide treatments. Excellent johnsongrass control approximately 50 DAT was achieved both years with all the glyphosate and graminicide treatments. In the nonsoybean fallow weed control programs where plots were tilled twice or three times fb one or two glyphosate applications, complete control of johnsongrass was obtained both years. In 1996 when glyphosate was applied EPOST or EPOST fb LPOST, soybean yields were equivalent and averaged 3.3 times that of the single LPOST glyphosate application. Soybean yields where the graminicides were used and where glyphosate was applied as a single LPOST treatment were no greater than the nontreated control. Economic analysis on the basis of soybean yield data and variable costs of herbicides, seed, field application, seedbed preparation, tillage, labor, fuel, repairs, and custom harvest expense in 1996 showed a positive net return only for glyphosate applied EPOST at 840 g/ha ($99.82/ha) or 1,120 g/ha ($46.94/ha) and for glyphosate applied at 560 g/ha EPOST fb LPOST ($10.41/ha). Although showing a negative net return, glyphosate applied EPOST at 2,240 g/ha ($−8.32/ha) or EPOST fb LPOST at 1,120 g/ha ($−50.97/ha), the loss was less than that for nonsoybean fallow tillage and glyphosate programs ($−155.70/ha and $−157.78/ha). In 1997, when soybean was not harvested because of environmental conditions, variable costs exceeded those of the nonsoybean programs, indicating that planting soybean strictly as a cover crop would not be economically advantageous. Sugarcane growth and yield the year following the fallow programs was not negatively affected by production of soybean regardless of herbicide program.

Keywords

Clethodimfluazifopglyphosatequizalofopsoybean, Glycine max (L.) Merr. ‘Hartz 4102 RR’sugarcane, Saccharum interspecific hybrids ‘CP 70-321’Graminicidesnet returnperennial weed controltillagevariable costsweed control programs
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 980 - 985
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, , 2001. Sugarcane production handbook. Web page:http://www.lsuagcenter.com/communications/pdfs_bak/pub2859sugarcane.pdf. Accessed September 16, 2004.Google Scholar
Boquet, D. J. 1998. Yield and risk utilizing short-season soybean production in the mid-southern USA. Crop Sci. 38:1004–1011.Google Scholar
Chen, J. C. P. and Chou, C. 1993. Cane Sugar Handbook. 12th ed. New York J. Wiley. 852–867.Google Scholar
Corbett, J. L., Askew, S. D., Thomas, W. E., and Wilcut, J. W. 2004. Weed efficacy evaluations for bromoxynil, glufosinate, glyphosate, pyrithiobac, and sulfosate. Weed Technol. 18:443–453.Google Scholar
Hilgenfeld, K. L., Martin, A. R., Mortensen, D. A., and Mason, S. C. 2004. Weed management in a glyphosate-resistant soybean system: weed species shifts. Weed Technol. 18:284–291.Google Scholar
Miller, D. K., Griffin, J. L., and Richard, E. P. Jr. 1998. Johnsongrass (Sorghum halepense) control and rainfastness with glyphosate and adjuvants. Weed Technol. 12:617–622.Google Scholar
Millhollon, R. W. 1995. Growth and yield of sugarcane as affected by johnsongrass (Sorghum halepense) interference. J. Am. Sugar Cane Technol. 15:32–40.Google Scholar
National Agricultural Statistical Service 2004. Transgenic Crop Acreage. Web page: http://www.usda.mannlib.cornell.edu/reports/nassr/field/pcp-bba/acrg0604.txt. Accessed: September 16, 2004.Google Scholar
Richard, E. P. Jr 1986. Influence of surfactants on the toxicity of asulam to johnsongrass (Sorghum halepense) and sugarcane (Saccharum sp.). Weed Sci. 34:299–303.Google Scholar
Richard, E. P. Jr 1992. Herbicide treatments for johnsongrass control in fallow sugarcane fields. J. Am. Soc. Sugarcane Technol. 12:112.Google Scholar
Richard, E. P. Jr 1995. Bermudagrass interference during a three year sugarcane crop cycle. Proc. Int. Soc. Sugar Cane Technol. 21:31–39.Google Scholar
Richard, E. P. Jr and Griffin, J. L. 1993. Johnsongrass (Sorghum halepense) control in sugarcane (Sacchuram sp.) with asulam applied alone and in mixtures. Weed Technol. 7:657–662.Google Scholar
Williams, C. S. and Hayes, R. M. 1984. Johnsongrass (Sorghum halepense) competition in soybeans (Glycine max). Weed Sci. 32:498–501.Google Scholar