This study has aimed to verify the influence of the droplets size categories and application volumes on burn down Urochloa ruziziensis and Conyza sp. Therefore, two trials were conducted in a randomized block design with four replications in a 2×4 split plot arrangement. The plots consisted in droplets size categories (very fine droplets and ultra coarse droplets) and the subplots consisted in four application volumes (50, 100, 150 and 200 L ha-1). For desiccation, glyphosate herbicide was used at 0.975 […]

The research goal was to evaluate the effects of silicone surfactant and simulated rainfall in glyphosate efficiency in controlling Brachiaria decumbens. The experiments were carried out at (a unit of the University of São Paulo) Escola Superior de Agricultura Luiz de Queiroz (ESALQ – Luiz de Queiroz College of Agriculture) in greenhouse conditions, in a randomized block design with four replications. In one experiment, a simulated rainfall of 10 mm was carried out, 30 minutes after treatments application, and in […]

Information regarding the desiccation of Brachiaria ruziziensis are scarce in the literature, especially with the use of contact action herbicides. The objective was to evaluate different doses and spray volumes of paraquat in the management of the desiccation of the foraging B. ruziziensis and the effects on soybean crop and weed suppression. The experimental design was completely randomized block with four replications. The treatments were arranged in a factorial scheme 4 x 6 + 1, corresponding to the evaluation of […]

In the desiccation of the vegetation cover, failures are of common occurrence, resulting from insufficient deposition of herbicides. Thus, it becomes important to know the factors that may interfere in the application. The present work aimed to investigate the efficiency of the pulverization of spray volumes in different weather conditions. The applications were carried out during the day for desiccation of Urochloa ruziziensis and spontaneous vegetation for no-tillage establishment. It was adopted a randomized block design with four replications in […]

The spray nozzles are responsible for the formation of droplets, each nozzle type exerts a different function, with its own characteristics related to the deposition of droplets according to the desired target. This study aimed to evaluate the distribution, droplet diameter and phytotoxicity of glyphosate and isoxaflutole herbicides applied in eucalyptus seedlings with air induction nozzles (AIUB 04 and TTI 110 04). The spectrum of droplet diameter was determined by particle size analyzer by laser light diffraction. The volumetric distribution […]

Brachiaria ruziziensis can contribute to the consolidation of the no-tillage system due to high production of biomass that can be used in integrated management of weeds. However, there is little information regarding the desiccation of this forage, particularly with the use of contact action herbicides. The present work aimed to evaluate the different management methods of desiccation of B. ruziziensis, and the effect in second season maize crop and weed suppression. The experimental design was a randomized complete block design […]

The study aimed to evaluate the efficiency and the quality of technology application of the tank mixture of glyphosate + carfentrazone-ethyl in Commelina diffusa control. The experiment was conducted in plastic greenhouse and the experimental units were represented by vessels with four plants of C. diffusa. The experimental design was the entirely randomized, with nine treatments in a factorial scheme (4×2)+1, being four spray nozzles, (XR11002; DG11002; TT11002 and AI11002), two spray solutions of glyphosate + carfentrazone-ethy at 480 + […]

The use of contact action herbicides with paraquat usually requires more attention with application technology aspects in relation to the systemic action ones. In order to evaluate the efficiency and deposition of paraquat application associated with adjuvant and nozzles inclination angle in weeds control, an experiment was conducted in field conditions using a factorial scheme 2 x 3 +1, with five repetitions. Seven treatments were constituted by two conditions of Gramoxone® herbicide (paraquat, 150 g a.e. ha-1), used with Agral® […]

The application of the mixture of glyphosate with 2,4-d took on great importance with high adoption of no-tillage system in the early 90s, and with the constant reports of weed biotypes resistant to glyphosate. However, studies on the drift of this mixture are still scarce. The aim of this study was to evaluate the potential drift of these herbicides, with or without the adjuvant, applied in wind tunnel. The experimental design was completely randomized considered, arranged in a factorial design […]

Several trials have been carried out for increasing glyphosate efficacy on weed burndown, including the addiction of ammonium sulfate and urea as adjuvants. On a physiological approach, there are explanations to complementary effect of these fertilizers when concomitantly added to herbicide spray solution. Therefore, three experiments were developed in field conditions with the objective of evaluating glyphosate efficacy for burning down different weed species by using solution of nitrogen fertilizers as spraying vehicles. Six treatments were evaluated, as follows: glyphosate […]