DIFFERENT HERBICIDES IN WEED CONTROL

Abstract

Weeds are hosts for pests and diseases, they compete for water, light and nutrients andmaking harvesting difficult, increasing costs for the producer, among other problemscaused. One of the species that has caused a lot of concern due to the rapid evolution is known as black beggarticks, Bidens pilosa and Brachiaria plantaginea. The work was carried out with the objective of testing the effectiveness of herbicides, being Glyphosate and Metsulfuron methyl alone or in combination with Saflufenacil herbicide have caused major negative impacts on agriculture in general, reducing productivity. The experiment was carried out in the Municipality of Machado - MG, at Sítio Santa Rosa, from September 10, 2022 to October 30, 2022. The design was in randomized blocks, in subdivided plots, containing five treatments and four replications, totaling forty experimental plots. The plastic container used was 1L, containing red oxisol substrate, bovine manure and sand, each plastic container received two seedlings of black beggarticks Bidens pilosa and also two seedlings of Brachiaria plantaginea. The applications were conducted when the seedlings reached a size of twenty centimeters in height, using a knapsack sprayer with a teejet 11002 tip, with the spray volume equivalent to (200 L* ha 1). The witnesses were free of application. Data were subjected to analysis of variance and compared by Tukey's test at 5% probability in the SISVAR® statistical program (FERREIRA, 2014). The treatment in which the herbicide Glyphosate was used in isolated application was the one that presented the best efficacy in the control of mono and dicotyledonous plants, the isolated application in which the herbicide Metsulfurom was used did not show a significant reduction in dry mass. the mixed treatments, 3 and 4, were statistically equal, superior to the control and differed from the control. For applications in mixtures, there was no reduction in the dry mass of the root system.