Spray drift and droplet spectrum from dicamba sprayed alone or mixed with adjuvants using air-induction nozzles

Authors

  • Guilherme Sousa Alves Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Caixa Postal 593, CEP 38408-100 Uberlândia, MG.
  • Greg Robert Kruger University of Nebraska-Lincoln, West Central Research and Extension Center, Zip Code 69101 North Platte, NE, USA.
  • João Paulo Arantes Rodrigues da Cunha Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Caixa Postal 593, CEP 38408-100 Uberlândia, MG.

DOI:

https://doi.org/10.1590/S1678-3921.pab2018.v53.25993

Keywords:

air-induction nozzle, droplet size, herbicide drift, nozzle type, wind tunnel

Abstract

The objective of this work was to evaluate the spray drift and droplet spectrum of dicamba applied alone or with potential drift-reducing adjuvants, using air-induction flat fan nozzles. Standard (XR and TT) and air-induction (AIXR and TTI) nozzles were evaluated in a wind tunnel. The adjuvants used were polymer, ammonium sulfate, vegetable oil, and phosphatidylcholine. The applications were conducted at 276 kPa pressure and 3.5 m s-1 wind speed. The droplet spectrum was measured using a laser diffraction system. Round strings were used as drift collectors, positioned perpendicularly to the wind direction, at 2, 3, 4, 5, 6, 7, and 12 m from the nozzle. Drift was calculated by quantifying, through fluorimetry, a fluorescent tracer added to each solution at 1 g L-1. Droplet spectrum and dicamba drift depend on the interaction between spray composition and nozzle type. Air-induction nozzles are more recommended for dicamba applications, especially the TTI nozzle. Polymer and ammonium sulfate increase droplet size in all nozzle types, which may reduce drift to nearby crops.

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Published

2018-08-23

How to Cite

Alves, G. S., Kruger, G. R., & Cunha, J. P. A. R. da. (2018). Spray drift and droplet spectrum from dicamba sprayed alone or mixed with adjuvants using air-induction nozzles. Pesquisa Agropecuaria Brasileira, 53(6), 693–702. https://doi.org/10.1590/S1678-3921.pab2018.v53.25993

Issue

Section

DISEASES CONTROL