Graduate Thesis Or Dissertation

Herbicidal effect of glyphosate as influenced by spray drop size

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  • An aqueous solution of technical glyphosate [N-(phosphonomethyl) glycine] was applied in homogeneous sprays of 120, 180 and 300 μm droplets to seedlings of a bush type green bean (Phaseolus vulgaris L. 'OSU 1604') at a carrier rate of 20 1/ha. At each droplet size all combinations of 3 dosage levels of glyphosate, with or without the addition of a non-ionic surfactant (X-77), were compared. Plant growth decreased as glyphosate dosage increased. There was no significant effect of adding surfactant. When compared with 180 μm droplets, approximately 2.2 times and 1.6 times as much active ingredient was needed to give a 50% growth reduction with 120 and 300 μm droplets, respectively. A preliminary study of effect of surfactant concentration on glyphosate toxicity indicated both surface tension and contact angle of the spray solution had no significant relation to the phytotoxicity of the herbicide spray. Surfactant (X-77) enhanced the phytotoxicity of glyphosate most at the concentration of 0.1% v/v.
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