Seletividade da cultura do amendoim com mistura de herbicidas em tanque

• Autor(a) principal: Marques, Gabriel Ranchert
• Data de Publicação: 2021
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/214073
• topic: Erva daninha; Herbicidas; Fitotoxicinas

The mixture of herbicides in agricultural crops is a weed management strategy that has been employed for many years throughout the country. However, it is a practice that has been regulated recently, so it has often been employed indiscriminately and inappropriately. For the peanut crop, there is a great lack of information about the mixture of herbicides and the damage that this practice can cause in the crop. Therefore, this work aimed to evaluate the selectivity of herbicide mixtures applied in pre-emergence on the peanut crop. The experimental design was in randomized blocks, with 13 mixtures of herbicides applied in pre-emergence and a control (without chemical treatment), with 4 repetitions. Throughout the experimental period, biweekly evaluations of peanut intoxication were performed from 7 to 84 days after application (DAA) of the mixtures. In addition, at the reproductive stages R2 and R3, the interception fraction of photosynthetically active radiation, chlorophyll contents, and peanut aboveground dry mass were also determined. At the end of the peanut cycle (140 days after sowing - DAS) pod productivity was determined and the data extrapolated to kg ha-1. The results were submitted to variance analysis using the F test, and the means were compared using the Tukey test at 5% probability. When significant, the intoxication data were also submitted to quadratic polynomial regression or correlation analysis. Among the treatments and parameters evaluated, it was found that the mixture of flumioxazin + chlorimuron, sulfentrazone + imazetapyr and sulfentrazone + clomazone provided significant reductions of all parameters. In possession of the results raised in this study, it was concluded that the mixture of the herbicides diclosulan + s-metolachlor, diclosulan + trifluralin, diclosulan + imazetapir, flumioxazin + imazetapir and flumioxazin + imazapic is selective for peanut crop. At the doses, soil type and edaphoclimatic conditions studied, the mixture of the active ingredients flumioxazin + trifluralin. flumioxazin + smetolachlor, fomesafen + s-metolachlor, diclosulan + imazapic, imazetapir + flumioxazin, sulfentrazone + imazetapir, flumioxazin + chlorimuron and sulfentrazone + clomazone are not selective for the crop, and may cause losses of up to 56% in peanut productivity.