Abstract
ABSTRACT Arotary cup atomizer was compared to a fan nozzle while applying glyphosate [N-(phosphonomethyl) glycine], paraquat (1,1 '-dimethyl-4,4'-bipyridinium ion), and bentazon [3-isopropyl-lH-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidej. Analysis of droplet size spectrum data and field weed control results showed that glyphosate at <0.6 kg/ha applied in 56 L/ha with a volume median diameter of 298 jum was more effective in control of weeds than when applied in 28 L/ha with a volume median diameter of 238 pun. Weed control ratings showed that for one year of a two-year study weed control with glyphosate was affected by application volume and equipment. Glyphosate applied in 56 L/ha with the rotary atomizer provided better weed control than when applied in 28 L/ha with a rotary atomizer or applied in 187 L/Ha with fan nozzles (276 kPa). No more than 3.7% of the spray volume was found in droplets <99 jum when glyphosate was applied with the fan nozzle in 187 L/ha. While there was significantly more glyphosate in small droplets when applied with the fan nozzle, a volume of only 3.7% is very small when considering the precision in application of this herbicide. The efficacy of glyphosate appears to be affected by its concentration in the total spray mix or by its droplet size. Weed control obtained with paraquat and bentazon was not affected by application volume or equipment.
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