Sensitivity of soybean cultivars to the herbicide metribuzin
DOI:
https://doi.org/10.5433/1679-0359.2026v47n1p47Keywords:
Selectivity, Glycine max, Integrated weed management, Resistance.Abstract
Weed resistance to herbicides, especially glyphosate, has made their management difficult in soybean crops. One alternative is the use of pre-emergent herbicides. However, even when recommended for the crop, selectivity depends on several factors, including the soybean cultivar. In this sense, the objective of this work was to evaluate the sensitivity of different soybean cultivars to the herbicide metribuzin. The experiment was conducted in a greenhouse in a completely randomized design with four replications, in a 19 x 3 factorial arrangement. Factor A consisted of 19 soybean cultivars. Factor B consisted of three doses of metribuzin; zero, 480 g a.i. ha-1, and 960 g a.i. ha-1. The variables evaluated were: phytotoxicity, quantum efficiency of PSII (Fv/Fm), effective efficiency of PSII (YII), relative electron transport rate (rETR), plant height, and shoot dry mass (SDM). Data were subjected to analysis of variance (ANOVA) (p < 0.05) and means were compared using the Scott-Knott test (p < 0.05). A significant interaction was observed between the factors soybean cultivar and metribuzin dose. The herbicide metribuzin caused negative alterations in the physiological and growth characteristics of the plants, demonstrating the phytotoxicity of the herbicide in some soybean cultivars, especially at the highest dose evaluated. The cultivars M 5917, M 6130 I2X, M 6301 I2X, and NS 5252 I2X showed greater tolerance to metribuzin.
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