Benghal dayflower control with different glyphosate formulations 1

Benghal dayflower (Commelina benghalensis L.) is a weed plant that easily infests agricultural areas due to its aggressive characteristics associated with reproductive aspects of the species. One important aspect of this plant is presenting its tolerance to the glyphosate. An experiment in greenhouse was conducted to verify the effects of different formulations and commercial products of glyphosate in controlling benghal dayflower. The experimental design was completely randomized, with four replications. The plants were grown in pots filled with eight liters of substrate each, consisting of soil, sand and tanned cattle manure until they have reached the stage of development of the second growth sector, when the following products and their commercial formulations were applied: Roundup Original ® - isopropylamine salt; Trop ® - isopropylamine salt; Roundup WG ® - ammonium salt; Zapp QI ® - potassium salt; Roundup Transorb R ® = potassium salt and Crucial ® - isopropylamine salt + potassium salt. The intoxication of benghal dayflower plants was visually assessed at 7, 14 and 21 days after application of the products, and leaf area, dry matter of leaves, dry matter of the stem, dry matter of root and total dry matter at 21 days after application. The treatments show significant differences in the toxicity of the plants after 14 days of application, and at 21 days it was found that the products Roundup WG ® and Crucial ® were more toxic to plants. The products Roundup WG ® and Crucial ® were highlighted with greater reductions in dry matter of the leaves, stem and total plant. In general, the benghal dayflower has not been effectively controlled by the products at the doses tested and/or by the application after the emission of the second branch of weed. Among the commercial formulations or products, the ammonium salt is highlighted - Roundup WG ® and the mixture of isopropylamine salt with potassium salt - Crucial ® presents higher efficiency in weed control.