Search

The objective of this study was to evaluate the effectiveness of synthetic auxins in the control of Conyza sumatrensis in mixtures for use in the first application, and the effectiveness of burndown herbicides alone or in mixtures for use in the second application, in soybean pre-sowing. Experiment 1 consisted of auxin herbicides (fluroxypyr or dicamba) in mixtures with herbicides (glyphosate, glufosinate, saflufenacil, carfentrazone, and chlorimuron) used for the first application in pre-sowing. Experiment 2 consisted of burndown herbicides (diquat, glufosinate, glyphosate, chlorimuron, saflufenacil, and carfentrazone), alone or at mixtures, used for sequential application in pre-sowing. For the first application, the effectiveness of glyphosate + dicamba or fluroxypyr was low and must be complemented by the addition of a PPO-inhibiting herbicide, mainly saflufenacil. The mixture of glufosinate, instead of glyphosate, with synthetic auxin was more effective, even increasing with the addition of saflufenacil. For the second application, with burndown herbicides, glufosinate was superior and effective when mixed with saflufenacil. For the first application in soybean pre-sowing, glyphosate or glufosinate + synthetic auxin + saflufenacil are effective for the control of C. sumatrensis. For the second application, glufosinate at mixtures is effective in controlling C. sumatrensis. [ABSTRACT FROM AUTHOR]

Diquat, glufosinate and the combination of the latter with carfentrazone or saflufenacil are believed to be as effective for pre-harvest desiccation of soybean plants as paraquat. This work was developed with the objective of evaluating the efficacy of paraquat, diquat, and glufosinate alone or at mixtures of carfentrazone or saflufenacil in pre-harvest desiccation of soybean. Soybean defoliation, maturity and yield were evaluated. Similar efficacy was observed between glufosinate and paraquat in soybean defoliation and maturity, in addition to a greater flexibility of use, in which it could be an anticipator and standardizing agent of the harvest. The application of diquat (200 g of active ingredient [a.i.] ha-1 ), paraquat (200 g a.i. ha-1 ) or glufosinate (400 or 500 g a.i. ha-1 ) was effective for pre-harvest desiccation of soybean at the R7.2 stage. As well, it was observed promising results for application of glufosinate + saflufenacil (300 + 24.5 g a.i. ha-1 ), glufosinate + carfentrazone (200 + 25 g a.i. ha-1 ), glufosinate + saflufenacil (200 + 35 g a.i. ha-1 ). Diquat and glufosinate can replace paraquat in pre-harvest desiccation of soybean plants, and glufosinate also provide greater management flexibility, in anticipating the harvest. [ABSTRACT FROM AUTHOR]

Within the Ecuadorian native vegetation, weeds have been the plant that at any given time can compete for water, nutrients, light, space and carbon dioxide (CO2) with a crop, affecting productivity in quantity. and quality. Thus, this research aims to analyze the efficiency of two chemical herbicides for weed control in banana crops and thus determine the effect caused by both Ametrine and Ammonium Glufosinate. Based on the analysis of results, through the combined use of the herbicides Ametrine and Glufosinate ammonium, a higher percentage of effectiveness was observed in the control of weeds in the plantain crop (Musa × paradisiaca). Compared to the other treatments applied, this strategy is relevant since it guarantees good growth and essential development of the crop. [ABSTRACT FROM AUTHOR]