Avaliação qualitativa e quantitativa da deposição de calda de pulverização em Commelina diffusa

Abstract

RESUMO -Objetivou-se neste trabalho avaliar a quantidade e qualidade da deposição da calda de pulverização em plantas de Commelina diffusa, considerando volumes de aplicação, pontas de pulverização e o ângulo dos bicos na barra de pulverização. Foram Palavras-chave: volume de aplicação, tecnologia de aplicação, planta daninha.ABSTRACT -The objective of this study was to evaluate the quantity and quality of spray deposition in Commelina diffusa plants, considering application volume, spray nozzles and the angle of the bar of the spray nozzles. Five stems of plants/pot were planted. The experimental treatments were set up on a randomized design with twenty replications. The experiment was carried out under greenhouse conditions and the solution was applied after 40 days of stem transplanting, when the plants were between 30 to 40 cm long (in full development). Five spray nozzles (TX-VK 6 (100 L ha , except for TJ60 11002 VS nozzle. Brilliant blue FDC -1 was used as a tracer solution, with 500 ppm to determine spray deposition. Immediately after application, twenty weed stems were collected, and washed in 100 mL of distilled water for posterior tracer quantification in a spectrophotometer. The data were adjusted to a regression curve, according to the Gompertz model. Independent of the spray nozzle used, the volume of 200 L ha -1 provided the most deposits on the plants, with the TJ60 nozzle being the most outstanding. The XR 11001 VS nozzle (100 L ha -1 ) provided the best uniformity when an angle of +30 o was used.

Control of conyza bonariensis with glyphosate associated to adjuvants applied with different spray nozzles

“…Adding to this, the combination of adjuvants with herbicide solutions, especially glyphosate, has become a common practice that aims at increasing control efficiency and reducing the dose of the product, since the adjuvants act on the physicochemical features of the solution, increasing the surface wettability and reducing superficial tension and the contact angle of the drop, as well as enhancing the penetration capacity of the active ingredient through the plant cuticle (RODRIGUES-COSTA et al, 2011;MINGUELA;CUNHA, 2010).…”