Navegando por Autor "Ferreira, Luiz Augusto Inojosa"

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    Armazenamento de misturas de herbicidas nas características físico-químicas e no controle de plantas daninhas
    (Universidade Estadual do Norte do Paraná, 2019-11-22) Ferreira, Luiz Augusto Inojosa; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Osipe, Jethro Barros; http://lattes.cnpq.br/9692340257207288; Lima, Julião Soares de Souza; https://orcid.org/0000-0002-8178-3937; http://lattes.cnpq.br/4456536143814608; Gandolfo, Marco Antônio; https://orcid.org/0000-0003-2314-3752; http://lattes.cnpq.br/5560552732033631; Rodrigues, Euripedes Bomfim; https://orcid.org/0000-0001-6531-878X; http://lattes.cnpq.br/9720688699522760
    The objective of this research was to evaluate the effect of the storage time of two post emergent herbicide mixtures on the physical and chemical characteristics of the spray solution and on the weed control efficiency. In three environments, experiments were carried out using weeds and soybean plants sensitive to herbicides. The first experiment was carried out with the species Amaranthus retroflexus, Commelina benghalensis and Sorghum halepense, using the mixture of glyphosate + 2,4-D + vegetable oil, the second with Chloris polydactyla using the mixture of glyphosate + clethodim + mineral oil and the third with Glycine max (L.) with the mixture of glyphosate + 2,4-D + vegetable oil, all submitted to five storage periods (at the time of preparation, 1, 2, 4 and 8 days after preparation). The spray solution were prepared in plastic (50 L) sealed gallons, stored in the laboratory at room temperature and shaken manually once a day. In experiments 1 and 2 the visual evaluations of control were performed at 7, 14, 28, and 42 days after application (DAA) and in experiment 3 at 3, 7, 10 and 21 DAA, due to sensitivity of the species. In both cases, performed by two evaluators, without previous knowledge of each treatment. The two mixtures used in the experiments were prepared in volumetric flasks for the evaluation of surface tension, density and pH. For the experiment 1, at 42 DAA, mean control scores in all treatments did not show significant differences, reaching satisfactory values (>80%) for A. retroflexus and S. halepense species. In Experiment 2, at 42 DAA, there was no effect of storage of the spray solution on the control of C. polydactyla, which remained below 80% for all treatments. At 21 DAA, in the experiment 3, all the treatments presented control close to 100% for the soybean plants, a result expected to be a non-glyphosate resistant cultivar. There was no change in the physical and chemical characteristics (surface tension, density and pH) for the two mixtures, regardless of storage period. With these results, it is concluded that storage of glyphosate + 2,4-D and glyphosate + clethodim for up to 8 days may be a strategy when agrometeorological conditions for application are not adequate.