Revista Brasileira De Herbicidas 2020; 19(3): 1-8
PHYSICAL-CHEMICAL COMPATIBILITY OF DIFFERENT DOSES AND MIXTURES OF HERBICIDES
The maintenance of the productivity of commercial crops is dependent on the use of phytosanitary products, but information about the interaction between them when used in mixture is restricted. The objective was to evaluate the physical properties, droplet spectrum and the physicochemical compatibility of mixtures with different doses and mixtures of herbicides. The treatments consisted of combining a formulation of the herbicide glyphosate with two commercial products formulated with the herbicide atrazine. The syrups were evaluated by the static method of physicochemical compatibility, obtaining descriptive tables regarding the aspects of homogeneity/heterogeneity. The measurements of the surface tension and contact angle were performed for one minute using the droplet method to determine the surface tension kinetics and the sessile droplet method to determine the contact angle. The evaluated parameters of the droplet spectrum produced by each treatment were the median volumetric diameter, the uniformity coefficient and the percentage of volume in droplets with diameters less than 100 μm. Constant agitation of the phytosanitary syrup before and during application is essential to reduce problems of incompatibility between products. The spectrum of droplets can vary according to the composition of the spray solution and the dose of the product used.
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