Author
 |
Hanks, James |
|
Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only Publication Acceptance Date: 4/10/1997 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Spray droplet spectra of three glyphosate formulations were analyzed to determine the effect of surfactants on drift potential. The percent of spray volume in droplets less than 105 microns was determined for spray mixtures of Roundup, D-Pak, and Roundup Ultra with surfactants Induce, Activate Plus, and Surf Aid. The percentage spray volume in droplets <105 microns with D-Pak was less than water, whereas Roundup and Ultra were greater than water with no surfactant added. Roundup and Ultra were the same at the lowest pressure, but Roundup produced a greater percentage with increasing pressure. Surf Aid produced higher percentages of spray volume in droplets <105 microns than water, whereas Activate Plus and Induce were similar to water at lower pressures and produced a lower percentage as pressure increased. Surf Aid increased the percentage with D-Pak above that of water and were higher than Ultra at a pressure of 345 kPa, but had little effect on Roundup even though it produced percentages higher than Ultra with no surfactant added to the Roundup. Induce significantly reduced the percentage with Roundup at low pressure, but had little effect at higher pressures. Activate Plus added to Roundup and D-Pak produced similar percentages as water alone. In summary, the drift potential of the three glyphosate formulations can significantly vary depending on the surfactant used and the spray pressure. |
