Effect of the use of subdoses of herbicides in the management of species of the genre urochloa

Authors

DOI:

https://doi.org/10.20873/2025_out_176100

Abstract

The experiment evaluated the treatments mesotrione + atrazine, mesotrione + terbuthylazine, nicosulfuron + atrazine and nicosulfuron + terbuthylazine, in subdoses, regarding the phytotoxicity observed in U. brizantha and U. ruziziensis, and in corn crops. The design was randomized in blocks, with 11 treatments and 2 forage species, in three replications. In the field, the corn was sown mechanically and the brachiarias were seeded, the treatments were applied 15 days after the emergence (DAE) of the corn, to the first pair of forage leaves. Poisoning in brachiaria and corn was evaluated at 7, 14 and 21 days after application (DAA), in addition to weed control. At 21 DAA, none of the treatments caused phytotoxicity above 25% in forages, and 30% in corn. For the control of weed species, areas with U. brizantha allowed better control associated with subdoses of herbicides than in U. ruziziensis. In a greenhouse, the phytotoxicities presented by these treatments were analyzed at stages 15 and 30 DAS of forage development, at 7, 14 and 21 DAA, and it was found that all treatments would be indicated for 30 DAS, with the exception of nicosulfuron + atrazine (20 + 800 g a.i. ha-1), in U. brizantha.

Published

2025-10-20

How to Cite

Castro Guidette, L. G., Andrea Monquero, P., Ferrari Schedenffeldt, B., Oliva da Silva, R., & Barbugian Ramalho Siqueira, B. (2025). Effect of the use of subdoses of herbicides in the management of species of the genre urochloa. DESAFIOS - Revista Interdisciplinar Da Universidade Federal Do Tocantins, 12(6), 177–198. https://doi.org/10.20873/2025_out_176100

Most read articles by the same author(s)