ABSTRACT spray droplet size is a major concern to herbicide applicators because: 1) most post-emergence herbicides must be applied uniformly and give complete coverage of target plants for greatest efficacy; and 2) spray drift to non-target areas must be minimized. The effects of rice herbicide formulations, concentrations, and tank mixtures; surfactants; polymers; and spray nozzle orientation in an airstream was determined in relation to the size of spray droplets produced by hollow cone nozzles. Several droplet-size statistics were significantly affected by herbicide formulations, tank mixtures, and polymer concentrations. Increasing the concentration of herbicide in the spray mixture or changing the nozzle orientation from 0 to 45 with respect to the airstream affected droplet size less than mixture type or polymer concentration.
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Bouse et al. (1990) studied this question.