Abstract
This study defined the main adjuvant characteristics that may influence or help to understand drift formation process in the agricultural spraying. It was evaluated 33 aqueous solutions from combinations of various adjuvants and concentrations. Then, drifting was quantified by means of wind tunnel; and variables such as percentage of droplets smaller than 50 μm (V50), 100 μm (V100), diameter of mean volume (DMV), droplet diameter composing 10% of the sprayed volume (DV0.1), viscosity, density and surface tension. Assays were performed in triplicate, using Teejet XR8003 flat fan nozzles at 200 kPa (medium size droplets). Spray solutions were stained with Brilliant Blue Dye at 0.6% (m/ v). DMV, V100, viscosity cause most influence on drift hazardous. Adjuvant characteristics and respective methods of evaluation have applicability in drift risk by agricultural spray adjuvants.
Highlights
Adjuvants are products added to the spray solution with specific functions
Potential drift risk have been satisfactory estimated by means of wind tunnel method (MOREIRA JÚNIOR & ANTUNIASSI, 2010)
The greatest correlation was in diameter of mean volume (DMV) (-0.59), followed by DV0.1 (r = -0.49), density (r = -0.47) and viscosity (r = -0.46)
Summary
Adjuvants are products added to the spray solution with specific functions. Activator adjuvants directly improve pesticide efficiency increasing plant absorption rate. Previous studies with products other than Brazilian ones have shown physical properties changes in spray and reduced drift risk by adjuvant addition. These effects were confirmed both in experiments in which drift was measured by wind tunnels and directly in the field (OLIVEIRA et al, 2013). Potential drift risk have been satisfactory estimated by means of wind tunnel method (MOREIRA JÚNIOR & ANTUNIASSI, 2010).
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