Herbicide efficacy in relation to herbicide rate, surfactant rate and spray applicattion volume

摘要

IN two experiments, a central composite response surface design was used to investigate the interactions between herbicide rate (glyphosate in Experiment 1 and metsulfuron in Experiment 2), surfactant rate, and spray application volume on tomato dry weight production. In both experiments, dry weight production was affected by herbicide, and surfactant rate but not spray application volume. Equations derived to predict the response of tomato dry weight production to rates of either, glyphosate or metsulfuron, and surfactant explained 89 percent and 75 percent of the observed variability respecttively. The results suggest that spray application volumes may be decreased without reducing herbicidal efficacy, provided the rates of herbicide and surfactant are maintained constant.