Chemical control of signalgrass in alfalfa crops

Authors

  • Renan Coelho Dias Universidade Federal dos Vales do Jequitinhonha e Mucuri
  • Márcia Vitória Santos Universidade Federal dos Vales do Jequitinhonha e Mucuri
  • Fabiana Lopes Ramos de Oliveira Universidade Federal dos Vales do Jequitinhonha e Mucuri
  • Evander Alves Ferreira Universidade Federal dos Vales do Jequitinhonha e Mucuri
  • José Barbosa dos Santos Universidade Federal dos Vales do Jequitinhonha e Mucuri
  • Bárbara Martins Rodrigues Universidade Federal dos Vales do Jequitinhonha e Mucuri
  • Cézar Augusto Martins Universidade Federal dos Vales do Jequitinhonha e Mucuri

DOI:

https://doi.org/10.5433/1679-0359.2017v38n6p3695

Keywords:

Photosynthesis, Chlorophyll a fluorescence, Fluazifop-p-butyl, Medicago sativa, Electron transport rate.

Abstract

The use of herbicides to control grass in Medicago sativa (alfalfa) pastures is still incipient. Therefore, the objective of this study was to evaluate the efficiency of fluazifop-p-butyl in the control of Brachiaria decumbens (signalgrass) in alfalfa. Thus, randomized block design was used, with seven doses of fluazifop-p-butyl (0, 25, 50, 100, 200, 300, 400 g ha-1), and four replications. Herbicide application was performed when the plants had about 20 cm height. Chlorophyll fluorescence, control of signalgrass and alfalfa toxicity were evaluated at 7, 15 e 30 days after application (DAA) and, at 45 DAA and 45 days after cut (DAC), both species were cut and tiller density, as well as branches and dry matter of forage species, were determined. Fluazifop-p-butyl does not affect the integrity of the photosynthetic apparatus of alfalfa plants, due to high tolerance to this mechanism of action presented by dicotyledonous species. However, signalgrass had physiological variables negatively affected by the herbicide, indicating the presence of physiological stress, even at the lowest doses of the product. The dose of 50 g ha-1 of fluazifop-p-butyl is effective in controlling signalgrass, without causing physiological and growth damage in alfalfa plants.

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Author Biographies

Renan Coelho Dias, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Engº Agr°, M.e em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, UFVJM, Diamantina, MG, Brasil.

Márcia Vitória Santos, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Profª Drª Zootecnista, Departamento de Zootecnia, CCA, UFVJM, Diamantina, MG, Brasil.

Fabiana Lopes Ramos de Oliveira, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Drª em Zootecnia, Zootecnista, UFVJM, Diamantina, MG, Brasil.

Evander Alves Ferreira, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Engº Agr°, Dr. em Fitotecnia, UFVJM, Diamantina, MG, Brasil.

José Barbosa dos Santos, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Engº Agr°, Dr. em Fitotecnia, UFVJM, Diamantina, MG, Brasil.

Bárbara Martins Rodrigues, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Discente, Curso de Mestrado, Programa de Pós-Graduação em Zootecnia, UFMG, Montes Claros, MG, Brasil.

Cézar Augusto Martins, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Discente, Curso de Zootecnia, UFVJM, Diamantina, MG, Brasil.

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Published

2017-11-23

How to Cite

Dias, R. C., Santos, M. V., Oliveira, F. L. R. de, Ferreira, E. A., Santos, J. B. dos, Rodrigues, B. M., & Martins, C. A. (2017). Chemical control of signalgrass in alfalfa crops. Semina: Ciências Agrárias, 38(6), 3695–3704. https://doi.org/10.5433/1679-0359.2017v38n6p3695

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