Physical and chemical compatibility of fungicides and adjuvant
DOI:
https://doi.org/10.36560/14520211275Keywords:
Acidity. Electric conductivity. Alkaline hydrolysis. Hydrogen potential. Pulverization.Abstract
Adjuvants can improve the quality of applications, but the adjuvant and pesticide interaction is a complex process, which involves many physical, chemical and physiological aspects, and can vary for each condition tested. Thus, the objective was to evaluate the physical-chemical compatibility of fungicide mixtures commonly used in soybean culture associated with different adjuvants and with water. The experiment was conducted in a completely randomized design (DIC) in a 3 x 5 factorial scheme with four replications, the first factor referring to fungicides (Fox®, Orkestra® and Mancozeb Glory®) and the second factor to adjuvants (Assist®, Aureo ®, Nimbus®, Prime® + Prime citrus® and water). The concentration of the mixtures was stipulated by adopting a mix volume of 100 L ha-1 and the dose recommended by the manufacturers. The characteristics evaluated were: physical compatibility (presence or absence of flocculation, sedimentation, phase separation, lump formation, oil separation, crystal and cream formation and foam formation) and chemical compatibility (pH and electrical conductivity). The treatment means were compared by the Tukey test at 0.05 significance. Fungicides have different affinities with adjuvants and it is not possible to generalize the recommendations. The physical-chemical compatibility between the fungicides and the adjuvants evaluated is dependent on the resting period and constant agitation before and during application is essential. In the absence of agitation in the spray tank, the Aureo® adjuvant is more suitable for maintaining the physical homogeneity of the mixes. The greatest reduction in pH, as well as the greatest increase in the electrical conductivity of the fungicide mixtures were caused by the adjuvants: Prime® + Prime Citrus®.
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