DIFERENTES TIPOS DE SAIS DE GLIFOSATO APLICADOS EM DIFERENTES HORARIOS DO DIA EM Urochloa ruziziensis

Abstract

Glyphosate is one of the most widely used systemic broad-spectrum herbicides in the world. With the increase in cultivated area in Brazil, new challenges arise during the growing season. Urochloa ruziziensis, also known as Brachiaria ruziziensis, is a very common grass in Brazil, especially in integrated cropping systems, exhibiting low herbicide resistance, high nutritional value, and positive results with overseeding. The objective of this work was to evaluate the control efficiency of the herbicide glyphosate in Urochloa ruziziensis plants in relation to different application times and glyphosate salt formulations. This study presented a randomized block design (RBD) with 4 blocks and 7 treatments, totaling 100 plots, where different glyphosate salts were applied: Treatment A (Isopropylamine ₊ potassium salt), B (Potassium salt), C (Ammonium salt), D (Diammonium salt), E (Isopropylamine salt), F (Dimethylamine salt), and G (Control), which were repeated at four different application times (05:30, 09:00, 16:00, and 19:00). Evaluations were based on the concept of visual control efficiency (CE%), observing the percentage of dead plants in the plot, as well as using the Canopeo tool. The CE% did not show differences between the glyphosate salts. Regarding the application time, a difference was observed between the times, with the applications at 09:00 and 16:00 standing out, achieving higher control efficiency (CE%) values.