In field efficacy trials most glyphosate/surfactant combinations tested control barnyardgrass as well as pre-formulated glyphosate products 21 days after treatment (DAT). Pre-formulated glyphosate products controlled barnyardgrass quicker than combination treatments, most likely due to improved glyphosate formulations with improved surfactant systems. In greenhouse trials, pre-formulated glyphosate products exhibited greater fresh weight reductions across all species tested, including barnyardgrass, broadleaf signalgrass, hemp sesbania, johnsongrass, large crabgrass, pitted morningglory, prickly sida, sicklepod, yellow foxtail and Palmer amaranth. Nonionic tallow amine treatments exhibited variable control among species.
A shikimate analysis was developed using non-glyphosate-tolerant soybean to estimate efficacy of surfactants; data were then correlated to the visual efficacy data on barnyardgrass in the field. However, there was not sufficient variability in barnyardgrass control to use the shikimate analysis as a predictor.
|Advisor:||Shaw, David R.|
|Commitee:||Byrd, John D., Koger, Clifford H., Massey, Joseph H.|
|School:||Mississippi State University|
|Department:||Plant and Soil Sciences|
|School Location:||United States -- Mississippi|
|Source:||MAI 51/04M(E), Masters Abstracts International|
|Keywords:||Barnyardgrass, Glyphosate, Shikimic acid, Surfactants|
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