Phytotoxicity in soybean crop caused by simulated dicamba drift

Authors

  • Guilherme Sousa Alves Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus vUmuarama, Avenida Amazonas, s/no, Bloco 4C, CEP 38402-000 Uberlândia, MG.
  • João Paulo Arantes Rodrigues da Cunha Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus Umuarama, Avenida Amazonas, s/no, Bloco 4C, CEP 38402-000 Uberlândia, MG.
  • Sérgio Macedo Silva Universidade Federal dos Vales do Jequitinhonha e Mucuri, Instituto de Ciências Agrárias, Campus Unaí, Avenida Universitária, no 1.000, Universitários, CEP 38610-000 Unaí, MG.
  • Gustavo de Souza Vieira Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus Umuarama, Avenida Amazonas, s/no, Bloco 4C, CEP 38402-000 Uberlândia, MG.
  • Mariana Pistore Santos Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus Umuarama, Avenida Amazonas, s/no, Bloco 4C, CEP 38402-000 Uberlândia, MG.
  • Thiago Nunes Landim Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus Umuarama, Avenida Amazonas, s/no, Bloco 4C, CEP 38402-000 Uberlândia, MG.
  • Thales Cassemiro Alves Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus Umuarama, Avenida Amazonas, s/no, Bloco 4C, CEP 38402-000 Uberlândia, MG.

DOI:

https://doi.org/10.1590/S1678-3921.pab2021.v56.26912

Keywords:

Glycine max, phenological stage, symptomology, synthetic auxin, yield

Abstract

The objective of this work was to evaluate injury symptoms on soybean not tolerant to dicamba (3,6-dichloro-2-methoxybenzoic acid), as well as crop yield, after the application of sub-rates of the herbicide to simulate physical drift in tropical conditions. Dicamba rates of 0, 5.8, 14.4, 28.8, 57.6, and 576 g acid equivalent per hectare were applied at the vegetative (V3) and reproductive (R1) stages of soybean, using a backpack sprayer pressurized with CO2, equipped with air-induction flat fan spray nozzles; the pressure and rate of application were 250 kPa and 200 L ha-1, respectively. Visible injury, the soil-plant analysis development (SPAD) index (leaf chlorophyll content) at 14 days after herbicide application, and soybean crop yield were evaluated. These variables were influenced by the crop stage in which the dicamba rates were applied. Rates below 28.8 g ha-1 caused less injury to soybean when applied at the R1 stage; however, there were no differences in yield between stages. A 1% dicamba drift in tropical conditions reduces soybean yield by 12%.

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Published

2021-05-13

How to Cite

Alves, G. S., Cunha, J. P. A. R. da, Silva, S. M., Vieira, G. de S., Santos, M. P., Landim, T. N., & Alves, T. C. (2021). Phytotoxicity in soybean crop caused by simulated dicamba drift. Pesquisa Agropecuaria Brasileira, 56(Y), e01764. https://doi.org/10.1590/S1678-3921.pab2021.v56.26912

Issue

V.56, Jan./Dec., 2021 :Continuos publication

Section

CROP SCIENCE