Weed Control J 2025; 24: e202500808

ISSUE Cover

Association between glyphosate and foliar fertilizers based on sulfur and their effects on soybean RR®

DOI: 10.7824/wcj.2025;24:00808

Abstract:

Background:

The effects of applying herbicides in a mixture with foliar fertilizers on soybeans are extremely important for successful production.

Objective:

To evaluate the effect of glyphosate formulations applied in mixture with sulphate fertilizers on the soybean crop.

Methods:

The experiment was conducted in a randomized block design with four replications. The treatments were arranged in a 4 × 3 factorial scheme, with three glyphosate formulations: Roundup WG, Roundup Ultra and Glizmax, plus a weeded control. The second factor corresponded to two sulphur-based fertilizers: Nutrix Sulphur and Ammonium Thiosulphate, plus a level without the addition of the fertilizer.

Results:

Mixing the herbicides with the fertilizers did not affect weed control for Roundup WG and Roundup Ultra. The Glizmax + Nutrixofre mixture resulted in lower weed control. The mass of 100 grains was increased when Roundup WG was applied and reduced when Glizmax was applied, regardless of the mixture with sulphur. The treatments consisting only of the application of sulphate fertilizers and the absolute control had the highest levels of S in the leaf tissue. The use of Glizmax resulted in lower yields when mixed with fertilizers. The Roundup WG + ammonium thiosulphate mixture resulted in greater yield gains.

Conclusions:

The application of glyphosate-based herbicides in mixture with sulphate fertilizers affected soybean yields. The greatest yield gain was obtained from the application of Roundup WG in mixture with ammonium thiosulphate.