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ARS Home » Research » Publications at this Location » Publication #131811
Title: EFFECTS OF DRIFT CONTROL ADJUVANTS ON SPRAY APPLICATION PARAMETERS WITH CONVENTIONAL AND AIR INDUCTION NOZZLES

Author
item JONES, E - DREC
item Hanks, James
item WILLS, GARY - DREC

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/25/2004
Publication Date: 1/25/2004
Citation: Jones, E.J., Hanks, J.E., Wills, G.D. 2004. Effects of drift control adjuvants on spray application parameters with conventional and air induction nozzles. Proceedings of Southern Weed Science Society. 55:191.

Interpretive Summary: Abstract, not required.

Technical Abstract: Laboratory studies were conducted to determine the effect of four drift reducing adjuvants on the spray pattern and droplet size of glyphosate herbicide. Glyphosate was applied as both Rodeo and Roundup Ultra Max at 0.4 lb ai in 10 gallons per acre with both the TeeJet Extended Range 110015VS (XR) nozzle and the TeeJet Air Induction 110015VS (AI) nozzle and four experimental drift control adjuvants. When using the XR spray nozzle glyphosate as both Rodeo and Roundup Ultra Max alone and with the drift reducing adjuvants HM 9911 and HM 9911A each at 0.5 and 1% v/v resulted in 49.7 to 58% fine spray droplets (<144u). The addition of HM 9950 at 0.5 and 1% v/v reduced the fine droplets to 38.4 and 26.3% and to 34.2 and 17.3% for Rodeo and Roundup Ultra Max, respectively. The addition of HM 9752 reduced the fine droplets to 33.1 and 27.8% for Rodeo and Roundup Ultra Max, respectively, with this same nozzle type. The volume median diameter (DV.5) with Rodeo and Roundup Ultra Max both alone and with HM 9911 and HM 9911A was 128 to 145u. Using HM 9950 at 0.5 and 1% and HM 9752 the DV.5 was increased to 178, 241, and 205 and to 202, 351 and 234 with Rodeo and Roundup Ultra Max, respectively. With the AI nozzle, the overall percent of fine droplets was less and the DV.5 droplet size was greater than with the XR nozzle. Glyphosate as Rodeo and Roundup Ultra Max both alone and with HM 9911 and HM 9911A each at 0.5 and 1% resulted in percent fine droplets (<144u) from 3.1 to 8.5% Percent of fine droplets (144u) using HM 9950 at 0.5 and 1% and HM 9752 was reduced to 1.8 to 2.8%. DV.5 for Rodeo and Roundup Ultra Max with the combinations of HM 9911 and HM 9911A was 466 to 576u. The DV.5 of these glyphosate formulations was increased to 631 to 717u in combinations with HM 9950 and HM 9752.