Interações Entre Adjuvante E Pontas Hidráulicas No Controle Da Deriva De Glifosato

Abstract

RESUMO:Objetivou-se com este trabalho analisar as interações entre adjuvante e pontas hidráulicas no controle da deriva de glifosato. Primeiramente, avaliou-se o espectro de gotas, empregando-se o delineamento inteiramente casualizado (DIC), em parcela subdividida, avaliandose quatro soluções de aplicação (Parcelas): água; água + óleo mineral; água + glifosato; água + óleo mineral + glifosato e três modelos de pontas tipo leque(Subparcelas): simples (SL); duplo (DL) e duplo com indução de ar (DLI), com seis repetições. Determinou-se o diâmetro da mediana volumétrica; densidade de gotas; amplitude relativa e o potencial risco de deriva. Na etapa seguinte à deriva foi quantificada em túnel de vento, empregando o DIC em parcela sub subdividida, sendo avaliadas as quatro soluções de aplicação (Parcelas), os três modelos de pontas (Subparcelas), em duas velocidades de vento (Sub subparcelas): 1,0 e 2,0 m s -1 , com quatro repetições. Independentemente da solução de aplicação, a ponta DL apresentou os maiores valores de deriva, seguida da SL e DLI, respectivamente. A solução de aplicação água + óleo mineral + glifosato, proporcionou os menores valores de deriva para todas pontas hidráulicas avaliadas. A interação do glifosato com o óleo mineral, aplicado com a ponta DLI, tem potencial para reduzir a deriva no campo.Palavras-chave: tecnologia de aplicação, túnel de vento, espectro de gotas, redução de perdas, controle de qualidade. INTERACTIONS BETWEEN ADJUVANT AND HYDRAULIC NOZZLES IN THE CONTROL OF GLYPHOSATE DRIFTABSTRACT: The aim of this work was to analyze the interactions between adjuvant and the hydraulic nozzle in glyphosate drift control. Firstly, the droplet spectrum was evaluated using a completely randomized design (DIC) in a split plot, evaluating four application solutions (plots): water; water + mineral oil; water + glyphosate; water + mineral oil + glyphosate and three nozzle spray models (subplots): simple (SL); double (DL) and double with air induction (DLI), with six repetitions. The diameter of the volumetric median was determined; droplet density; relative amplitude and the potential risk of drift. In the following stage the drift was quantified in a wind tunnel, using the sub-subdivided DIC, being evaluated the four application solutions (parcels), the three nozzle spray models (subplots), in two wind speeds (sub-plots): 1.0 and 2.0 m s-1, with four repetitions. Regardless of the application solution, the DL tip presented the highest drift values, followed by SL and DLI, respectively. The application solution water + mineral oil + glyphosate, provided the lowest drift values for all hydraulic tips evaluated. The interaction of glyphosate with mineral oil, applied with the DLI tip, has the potential to reduce drift in the field.

Tecnologia de aplicação com o uso de diferentes adjuvantes na cultura da soja

“…This adjuvant presented droplets classified as extremely coarse, a fact that generates lower losses by drift and evaporation in situations of greater environmental risk (ALMEIDA et al 2014). When there is drift, such losses cause an increase in the doses of the products in the applications by farmers, as they think that the action was inefficient by the dose used, when in fact it was due to the action of loss by drift (VIEIRA et al 2019). The greatest dispersion in the application in the upper third occurred with LI700®, which showed the largest volume median diameter (VMD), of 1436.27 µm; however, it did not differ from the other treatments.…”

“…The use of chemical products can be considered one of the most critical steps in the soybean production chain, as this use requires a set of knowledge and techniques to ensure efficient and satisfactory control. The current increase in demand for food also results in an increased pressure to preserve the environment when using land for grain production, and this action affects the search for improvements in the techniques of application of phytosanitary products to ensure greater efficiency and environmental safety (VIEIRA et al 2019).…”

Spray solution deposition and Asian rust control in soybean cultivars

“…Chemical control is only carried out with knowledge of the application technology. The choice of spray nozzles for fungicide application is an important decision, aimed at producing the most homogeneous droplets possible (Vieira et al, 2019). The nozzles must provide efficient coverage of the target to ensure minimum fungicide wastage (Prado et al, 2015).…”