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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1986_vol40.pdf#page=1
Last checked: 07/25/2013
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Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Cranmer, John R.;
Duke, William B. |
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| Author Affiliation: | Department of Agronomy, Cornell University |
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| Title: | Effects of variations in drop makeup on the phytotoxicity of Glyphosate to quackgrass |
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| Source: | Proceedings of the Annual Meeting of the Northeastern Weed Science Society. Vol. 40, 1986, p. 1. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Elymus repens; Glyphosate; Phytotoxicity; Controlled Droplet Applicators
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| Abstract/Contents: | "Field studies were conducted in 1985 to evaluate how the concentration of active ingredient and surfactant in spray droplets of uniform size affected the phytotoxicity of glyphosate to quackgrass [Agropyron repens (L.) Beauv.]. Glyphosate was applied with controlled droplet application (CDA) units at 46.75 L/ha (5 GPA), 140.25 L/ha (15 GPA), and 420.75 L/ha (45 GPA). Both a technical grade of glyphosate (MON 0139-3, 41.0% isoproplyamine salt) and a commercially available formulatin of the isoproplyamine salt of glyphosate (Roundup) were used in these studies. A major difference between these two formulations of glyphosate is that the technical grade contains no surfactant, but the commercial formulation contains an undisclosed amount of a non-ionic surfactant. At a carrier volume of 46.75 L/ha, the technical grade of glyphosate was applied at 0.062, 0.187, and 0.56 kg/ha alond and in combination with the surfactant MON-0818 (the surfactant in the commercial glyphosate formulation) at 0.0417% (v/v). The 0.0147% surfactant concentration was that associated with a 0.062 kg/ha formulated glyphosate rate at the 46.75 L/ha spray volume. A commercial formulation of glyphosate was also applied at 0.062 and 0.56 kg/ha. At a carrier volume of 140.25 L/ha, the technical grade or the commercial formulation of glyphosate were applied at 0.187, 0.56, and 1.68 kg/a. The surfactant MON-0818 was used to obtain concentrations ranging from 0.0417 to 0.375% (v/v) in the spray solutions. At a carrier volume of 420.75 L/ha, the technical grade or the commercial formulation of glyphosate were applied at 0.56 and 5.4 kg/ha. MON-0818 was used to obtain concentrations ranging from 0.0147 to 0.375% (v/v) in the spray solutions. Visual ratings and quackgrass stand counts revealed that glyphosate applied at 0.56 kg/ha at a carrier volume of 46.75 or 140.25 L/ha was more effective in controlling quackgrass than when applied at a carrier volume of 420.75 L/ha. Increasing the surfactant concentration only slightly negated the loss in efficacy shown by the quackgrass plants treated at a carrier volume of 420.75 L/ha. However, when the glyphosate rate was increased to 5.04 kg/ha, the loss in efficacy previously exhibited by plants treated at a carrier volume of 420.75 L/ha was negated." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cranmer, J. R., and W. B. Duke. 1986. Effects of variations in drop makeup on the phytotoxicity of Glyphosate to quackgrass. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 40:p. 1. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1986_vol40.pdf#page=1
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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