PERFORMANCE OF SOYBEANS WITH THE APPLICATION OF GLYPHOSATE FORMULATIONS IN BIOSTIMULANT ASSOCIATION

Christiano Lima Lobo De Andrade,Rubem Silvério De Oliveira Júnior,Alessandro Guerra Da Silva,Gustavo André Simon,Guilherme Braga Pereira Braz

doi:10.1590/1983-21252020v33n210rc

Christiano Lima Lobo De Andrade, Rubem Silvério De Oliveira Júnior + Show 3 more

Open Access

https://doi.org/10.1590/1983-21252020v33n210rc

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Abstract

ABSTRACT Glyphosate is the main herbicide used in the Roundup Ready® (RR®) soybean crop. However, the different salt and herbicide formulations available on the market can lead to crop intoxication. In this scenario, biostimulants appear as a promising alternative to mitigate the possible phytotoxic effects of glyphosate. Thus, the objective of this work was to evaluate the effects of different MC Extra® biostimulant doses associated with glyphosate formulations on the agronomic characteristics of a herbicide-tolerant soybean cultivar. Two experiments were conducted in the 2015/16 and 2016/17 seasons with three doses of MC Extra® (0.35, 0.70, and 1.00 kg ha-1) associated with six formulations of glyphosate: Glyphotal®, Roundup Original®, Roundup Ready®, Roundup WG®, Roundup Transorb®, and Zapp QI®, plus additional treatment without the use of the herbicide. In both experiments, we used 900 g e.a. ha-1 of glyphosate. The results showed that the highest dose of MC Extra®, in combination with the Roundup Original®, Roundup Ready®, and Roundup Transorb® formulations and 0,70 kg ha-1 of MC Extra® with Glyphotal® provided the highest grain yields. When used in conjunction with the herbicide, there is a need to increase the dose of MC Extra® to obtain higher soybean yields.

Highlights

Brazil stands out as a major producer of soybeans, with prospects for the coming years to take the lead in the world ranking of this oilseed
Among the factors that contributed to the growth of the soy complex, we highlight the implementation of the Roundup Ready® (RR®) technology, a glyphosate-tolerant soybean cultivar (OSIPE et al, 2014; BOMTEMPO, 2016)
Glyphosate takes the form of a phosphonic anion, a conformation that promotes the immobilization of biand trivalent cations (VRIES; FEHR, 2011; BINSFELD et al, 2014)

Summary

Introduction

Brazil stands out as a major producer of soybeans, with prospects for the coming years to take the lead in the world ranking of this oilseed. Among the factors that contributed to the growth of the soy complex, we highlight the implementation of the Roundup Ready® (RR®) technology, a glyphosate-tolerant soybean cultivar (OSIPE et al, 2014; BOMTEMPO, 2016). This made it possible to rotate a molecule with a broad spectrum of action, which allowed for increased efficiency in weed control, besides reducing the injuries caused by the latifolicides traditionally used in conventional soy cultivation (ZOBIOLE; KREMER; CONSTANTIN, 2012; MEROTTO JR; WAGNER; MENEGUZZI, 2015). This, in turn, promotes a reduction in the accumulation of biomass, compromising plant growth and development (MACKINNON et al, 2010)

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