Navegando por Autor "Ferreira, Emilene Aparecida dos Santos"

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    Mudança de pH em caldas à base de glyphosate no controle de plantas daninhas
    (Universidade Estadual do Norte do Paraná, 2026) Ferreira, Emilene Aparecida dos Santos; Rodrigues, Diego Resende; https://orcid.org/0000-0002-9495-8943; http://lattes.cnpq.br/9381400899886153; Rodrigues, Diego Resende; https://orcid.org/0000-0002-9495-8943; http://lattes.cnpq.br/9381400899886153; Ferreira, Silvio Douglas; https://orcid.org/0000-0002-8989-4498; http://lattes.cnpq.br/0270087159948589; Gandolfo, Marco Antonio; https://orcid.org/0000-0003-2314-3752; http://lattes.cnpq.br/5560552732033631; Precipito, Lais Maria Bonadio; http://lattes.cnpq.br/5942464936055299
    Herbicide use has become essential in agricultural management, with glyphosate standing out as one of the most widely used active ingredients for the effective control of several weed species. Its mode of action is based on the inhibition of essential amino acid synthesis, thereby preventing plant growth. A key factor determining the efficacy of this herbicide is the pH of the spray solution. The level of acidity or alkalinity may affect both the stability of the active ingredient and its absorption by plants. Specifically, under acidic pH conditions, glyphosate molecules tend to remain in their non-dissociated form, which facilitates cuticular penetration. Therefore, the objective of this study was to evaluate the influence of pH variation on the efficacy of different commercial glyphosate formulations. For this purpose, seven formulations were tested at three pH levels: the original pH of each product, pH 3.0, and pH 9.0. Analyses of the physicochemical properties of the solutions were performed to better understand the behavior of the formulations under different conditions. Applications were carried out on Raphanus raphanistrum (wild radish), followed by visual assessments of control percentage. The Crucial® spray solution at pH 3.0 showed the best performance, achieving approximately 95% control at 28 days after application, demonstrating that herbicide efficacy depends on the interaction between formulation type, salt constituent, and spray solution pH.