Glyphosate formulations containing different salts in the desiccation of Urochloa brizantha "BRS Piatã"
DOI:
https://doi.org/10.5433/1679-0359.2025v46n4p1085Keywords:
Control, Doses, Herbicides, No-till, Pre-plantingAbstract
Glyphosate, the most widely used herbicide in the world, is marketed in different formulations and salts, which can alter its performance in the field. The objective of this study was to evaluate the efficiency of five different glyphosate formulations in the desiccation of Urochloa brizantha BRS "Piatã". Two experiments were conducted in two field locations: Alvorada do Sul-PR (Experiment 1) and Londrina-PR (Experiment 2). Five glyphosate formulations (isopropylamine salt, IPA; diammonium salt, Di-NH4+; potassium salt, K+; NH4+ salt; and IPA salt + K+) were tested at two rates: 900 and 1800 g a.e. haâ»1. In Experiment 1, the K+ salt formulation resulted in a faster effect than the others. The NH4+ and IPA formulations were slower, even 28 days after application. In Experiment 2, there was no difference between the formulations, except for the effect of the application rate. In general, the experiments demonstrated that the 1800 g a.e. haâ»1 rate was more effective in plant control than the 900 g a.e. haâ»1 rate, highlighting the importance of using the correct rate for desiccation, in addition to selecting the most appropriate formulation for each environment. The K+ salt formulation accelerated the mortality kinetics of Urochloa grass.
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Copyright (c) 2025 José Flavio Firmani, Gustavo Henrique Gasque, Alexandre Chiang, Ana Kely Meira Volpato, João Pedro Mariano Ogido, Rubia Fernanda Bovo, Halley Caixeta Oliveira, Giliardi Dalazen
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