Controle de trapoeraba com diferentes formulações de glyphosate

Abstract

-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. Keywords: Commelina benghalensis; isopropylamine salt; potassium salt; ammonium salt Resumo -A trapoeraba (Commelina benghalensis L.) é uma planta daninha que infesta facilmente áreas agrícolas devido à suas características de agressividade associadas aos aspectos reprodutivos da espécie. Um dos aspectos importantes desta planta apresentar é sua tolerância ao herbicida glyphosate. Um experimento em ambiente protegido foi realizado para verificar os efeitos de diferentes formulações e produtos comerciais do herbicida glyphosate no controle da trapoeraba. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro 1 Received for publication on 21/10/2015 and approved on 11/01/2016.

Weeds in Soybean Crop After Annual Crops and Pasture

“…According to Blanco (2014), this species can produce viable seeds both aerial and underground, in addition to presenting better adaptation to shaded environments. Another fact is that the herbicide used in the area desiccation was glyphosate, and according to Carvalho et al (2015), this species has a high tolerance to this herbicide.…”