Adjuvants are products added to spray solution in order to attend the pesticides application. However, their effects in the technical parameters of the spray are not yet fully understood. The objective was to evaluate the effects of addition of five adjuvants (A, B, C, D and E) and five dilutions (D1 = 30; D2 = 40; D3 = 50; D4 = 60 e D5 = 70 mL per 100 liters of water), and a control (distilled water) in the technical parameters of the spraying (Dv0.1; Dv0.5; Dv0.9 and Span index). The analysis of the droplet spectrum was performed using the droplet particle size analyzer (Spraytec, Malvern Instruments Co.), focal lens of 750 mm. The spraying was performed by a CO2 pressurized sprayer with a spray nozzle XR 11002VK. The sprayings were performed at pressure of 300 kPa. It was observed that there is not a linear relation between dilution and product, regarding the technical parameters of the spraying. As for the parameter Dv0.5 the highest value observed was for the product C on the dose D5 with 232.4 μm, while the control had an average of 148.99 um. In assessing the SPAN index of the different products and dosages tested, they did not improve significantly compared to the control.
Universidad de Tarapacá. Facultad de Ciencias Agronómicas