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ARS Home » Research » Publications at this Location » Publication #131816
Title: EFFECT OF NOZZLE TYPE ON GLYPHOSATE APPLICATIONS

Author
item JONES, ELIZABETH - DREC
item Hanks, James
item WILLS, GENE - DREC

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 1/7/2002
Publication Date: 1/7/2002
Citation: Jones, E.J., Hanks, J.E., Wills, G.D. 2002. Effect of nozzle type on glyphosate applications. 2002 National Cotton Council Beltwide Cotton Conference. CD-ROM.

Interpretive Summary: Abstract, not required.

Technical Abstract: Laboratory studies were conducted to determine the spray patterns and droplet sizes produced with combinations of glyphosate applied at 0.4 lb ai in 10 gallons per acre as Rodeo which has no surfactant and as Roundup Ultra Max which has a proprietary surfactant with each of two deposition aids, 1) HM 9752, a proprietary blend of polymeric viscosity modifiers and ammonium sulfate at 9 lb/100 gal, and 2) HM 9950, a proprietary blend of ammonium polyacrylates, hydroxy carboxylates, sulfates, and polymeric deposition aids at 1.0% v/v. Applications were made with the TeeJet Extended Range (XR) 110015VS and the TeeJet Air Induction (AI) 110015VS spray nozzles. The average droplet size decreased and the percent volume of fine droplets increased for each spray mixture as the spray pressure was increased for each nozzle type. When using the XR spray nozzle, glyphosate as both Rodeo and Roundup Ultra Max alone resulted in 47 to 62% and 50 to 64% volume of fine spray droplets, respectively. The addition of HM 9752 reduced the percent volume of fine droplets to 26 to 39% and to 24 to 35%, respectively. The addition of HM 9950 reduced the percent volume of fine droplets to 22 t0 36% and to 9 to 31%, respectively. When using the AI spray nozzle, glyphosate as both Rodeo and Roundup Ultra Max alone resulted in 7 to 10% and to 3 to 6% volume of fine spray droplets, respectively. The addition of HM 9752 reduced the percent volume of fine droplets to 2 to 4%, with Rodeo and Roundup Ultra Max, respectively. The addition of HM 9950 reduced the percent volume of fine droplets to 2 to 4%, with each glyphosate formulation. These results indicated the potential for drift can significantly be reduced with AI nozzles and proper selection of a drift control adjuvant.