Selectivity of the herbicide saflufenacil in different pre-sowing periods in soybean (Glycine max (L.) Merr.)
DOI:
https://doi.org/10.14808/sci.plena.2025.070204Keywords:
Glycine max, protox, yieldAbstract
Chemical control with herbicides is a fundamental strategy in the management of specific plants, and selectivity is a determining factor for crop efficacy and safety. This study aimed to evaluate the selectivity of mixtures containing glyphosate and saflufenacil in two RR soybean cultivars: BG 4377 RR and TMG 132 RR. The experiment was conducted in the field, in a randomized block design, with four replications and a 14 × 2 factorial scheme, involving 14 treatments with different transfers of glyphosate (1080 g a.e. ha⁻¹) and saflufenacil (35 and 49 g a.i. ha⁻¹), applied at four times: 0, 7, 14, and 21 days before sowing (DAS). Applications were made with coastal spraying under specific climatic conditions. The following evaluations were evaluated: stand, plant height, phytotoxicity, number of pods and grains per plant, thousand-seed weight, and productivity. The results indicate that the application time was crucial for agronomic performance: applications at 0 DAS with 49 g a.i. ha⁻¹ of saflufenacil caused greater phytotoxicity and reduction in stand, height, pods, and thousand-seed weight. Applications between 14 and 21 DAS, with 35 g a.i. ha⁻¹, reduced the toxic effects and improved development and productivity. The cultivar TMG 132 RR was more tolerant, while BG 4377 RR had better growth and yield with glyphosate alone. Therefore, choosing the right application time, together with the appropriate cultivar, is essential to improve efficient plant management and ensure high productivity.
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Copyright (c) 2025 Ronei Ben , Ana Karine de Aquino Nunes Ben, Renan Fonseca Nascentes, Plinio Saulo Simões, Caio Antonio Carbonari, Edivaldo Domingues Velini

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