Simulated drift of dicamba and 2,4-D on soybeans: effects of application dose and time

Authors

  • Estevam Matheus Costa Instituto Goiano de Agricultura
  • Adriano Jakelaitis Instituto Federal Goiano
  • Jacson Zuchi Instituto Federal Goiano
  • Leandro Spíndola Pereira Instituto Federal Goiano
  • Matheus Vinícius Abadia Ventura Instituto Federal Goiano
  • Gustavo Silva de Oliveira Instituto Federal Goiano
  • Gustavo Dorneles de Sousa Instituto Federal Goiano
  • Jeovane Nascimento Silva Instituto Federal Goiano

DOI:

https://doi.org/10.14393/BJ-v36n3a2020-47742

Keywords:

Glycine max (L.), Merrill, Auxin herbicides, Soybean-resistant herbicides

Abstract

The use of soybean varieties resistant to the herbicides dicamba and 2,4-D may lead to drifts towards areas grown with non-resistant varieties. The aim of this study was to evaluate the effects of dicamba and 2,4-D underdoses applied at the phenological stages V4 and R2 of soybeans. Two experiments were conducted with dicamba or 2,4-D in a randomized block design with four replications. The 4 × 2 + 1 factorial scheme was composed of four doses (0.028, 0.28, 2.8, and 28 g ae ha−1) of dicamba or 2,4-D applied at two phenological stages (V4 and R2) + a control treatment (without herbicide application). Dicamba underdoses caused damage to soybean crop affecting its vegetative growth and yield; the injuries caused by 2,4-D were neither enough to damage crop nor affect yield components. Dicamba underdoses applied at V4 caused injuries of up to 41%, while in R2 they reached 70%. Plant height decreased by up to 61% when treated with dicamba. Soybean yield was reduced by 29 and 76% when the simulated drift occurred at V4 and R2, respectively, and at a dose of 28 g ae ha−1 of dicamba. For the tested underdoses, only 2,4-D had no effect in soybean crop yield.

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Published

2020-04-13

How to Cite

COSTA, E.M., JAKELAITIS, A.., ZUCHI, J., PEREIRA, L.S., VENTURA, M.V.A., OLIVEIRA, G.S. de, SOUSA, G.D. de and SILVA, J.N., 2020. Simulated drift of dicamba and 2,4-D on soybeans: effects of application dose and time. Bioscience Journal [online], vol. 36, no. 3, pp. 857–864. [Accessed20 May 2022]. DOI 10.14393/BJ-v36n3a2020-47742. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/47742.

Issue

Section

Agricultural Sciences