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Commercial air inclusion and standard flat fan nozzles were used to examine some solutions containing either blank formulation components or adjuvants. Droplet-size (Dv0.5) measurements and corresponding retention and field studies were made.
In-flight temporal sampling revealed that the physico-chemical properties of the spray solution had a substantial effect on the Dv0.5 values produced by both standard flat fan and air inclusion nozzles. Applications containing adjuvants and formulants applied through standard fan nozzles confirmed previous findings: water-soluble additives reduced Dv0.5 while emulsions increased Dv0.5 values compared with water alone. However, Dv0.5 values of corresponding sprays produced by air inclusion nozzles behaved differently. Generally, emulsions decreased Dv0.5 values while those containing water-soluble additives increased droplet size. Corresponding retention studies revealed that adjuvant inclusion enhanced the performance of standard fan sprays; the performance of air-included sprays was more variable.
Nevertheless, field trials failed to confirm that these differences significantly affected herbicide performance.
air inclusion nozzles, venturi, spray drift, spray retention, adjuvants, droplet size
Product Manager, Lurmark Limited, Longstanton, Cambridge,