SYMPOSIA PAPER Published: 08 November 2018
STP161020170182

Droplet Spectra and Drift Potential Generated by Flat-Fan Nozzles Spraying New Formulations of 2,4-D Engineered for Drift Reduction

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The aim of this work was to analyze the effect of spray solutions containing new formulations of 2,4-D choline salt (Enlist™ with Colex-D™ and Enlist Duo™ with Colex-D) on the droplet spectra and drift potential generated by flat-fan nozzles. The experimental design included comparisons between solutions with a single herbicide in it: 2,4-D dimethylamine salt (DMA™ 806 BR) and 2,4-D choline salt (Enlist with Colex-D). We also compared the premix of 2,4-D choline salt and glyphosate dimethylamine salt (Enlist Duo Colex-D) with tank mixtures of the 2,4-D dimethylamine salt with three different formulations of glyphosate (Glizmax® Prime, Roundup Transorb R, and Zapp QI). Labeled rates of the herbicides were diluted to 80 L ha−1 and sprayed with flat-fan nozzles at 2.8 bar (Teejet XR11002 and AIXR11002). The volume median diameter and the percentage of droplets smaller than 105 µm (V105) were obtained using an online particle-size analysis system. The drift index was calculated based on data collected in a wind tunnel at a wind speed of 2.5 m s−1. The amount of drift deposited on nylon strings at 2 m downwind from the nozzle was converted to a percentage of the total volume of spray solution sprayed on each replication. The results showed that the new formulation of 2,4-D choline salt engineered for drift reduction (Enlist Colex-D) provided lower drift potential based on both the droplet spectra and the wind tunnel data compared to the standard 2,4-D dimethylamine salt. The same result was found when comparing the premix of 2,4-D choline salt and glyphosate dimethylamine salt with tank mixtures of 2,4-D dimethylamine salt with glyphosate, regardless of whether glyphosate formulation was part of the tank mixture.

Author Information

Antuniassi, Ulisses
São Paulo State University, Botucatu, São Paulo, BR
Moreira, Caio
São Paulo State University, Botucatu, São Paulo, BR
Chechetto, Rodolfo
AgroEfetiva, Botucatu, São Paulo, BR
Pinheiro, Ana Cristina
Corteva Agrisciences, Alameda Itapecuru, Barueri, São Paulo, BR
Lucio, Felipe
Corteva Agrisciences, Alameda Itapecuru, Barueri, São Paulo, BR
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Details
Developed by Committee: E35
Pages: 1–10
DOI: 10.1520/STP161020170182
ISBN-EB: 978-0-8031-7666-9
ISBN-13: 978-0-8031-7665-2