Abstract
Four low-drift nozzles working at various pressures, one twin-fluid nozzle at two liquid and air pressures and two conventional flat-fan nozzles were compared with respect to spray deposition and herbicidal efficacy. Measurements of spray deposit on oats ( Avena sativa) and white mustard ( Sinapis alba) using a tracer showed that conventional nozzles were superior to the other nozzle types in most settings. Low-drift nozzles in the majority of settings and the twin-fluid nozzle at low pressures gave poor deposition on oats. Deposition on white mustard was greater than on oats and differences between spray methods small, although highly variable with the twin-fluid nozzle. Herbicide applications in sugar beet fields did not reveal any difference in weed control or crop vigour between the spray methods, but weed counts were affected by the dose level applied. The design of spray application experiments is discussed.
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