Influence of Glyphosate Concentrations on Spray Solution Physicochemical Characteristics and Drift Potential

Almeida, Dieimisson Paulo; Ferreira, Marcelo da Costa; Santos, Renata Thaysa da Silva; Griesang, Fabiano; Santos, Eduardo Souza; Timossi, Paulo César

doi:10.1590/1809-4430-eng.agric.v40n1p69-77/2020

Cited by 4 publications

(2 citation statements)

References 32 publications

(48 reference statements)

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“…A less viscous spray solution can result in smaller drops, which have a greater propensity to be carried by the wind (Cunha et al, 2017;Assunção et al, 2019). Surface tension is the result of interactions that occur between the spray components, and high surface tension contributes to less effective spraying of herbicides (Almeida et al, 2020). In the present study, magnetization increased the surface tension of the spray solution, thereby reducing the spreading ability of the drop on the vegetable target.…”

Section: Discussionmentioning

confidence: 63%

Normalized difference vegetation index for desiccation evaluation with glyphosate + 2,4-D in magnetized spray solution

et al. 2023

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Water magnetization and geoprocessing are increasingly utilized tools in weed management. Our objective was to study the influence of water magnetization on herbicide efficiency and to verify whether there is a relationship between control scores and the normalized difference vegetation index (NDVI). In the laboratory experiment, water was subjected to magnetization and evaluated with respect to four characteristics. In the field experiment, plots of Brachiaria grass were subjected to treatments in a factorial scheme (6 × 2 + 1). Six herbicidal factors (doses of glyphosate and glyphosate + 2,4-D) and the magnetization or absence of magnetization of the spray solution were evaluated and compared against the control treatment (without spraying). Weed control assessments were carried out six times. Images were obtained using an embedded multispectral camera to determine the NDVI values. Data related to water characteristics were analyzed using the t test. Weed control and NDVI data were subjected to analysis of variance and are presented in regression graphs. Dispersion analysis of NDVI data was performed according to the control scores. The magnetization process decreased the pH of the water and increased the surface tension, but it did not influence the control scores or the NDVI. As the glyphosate dose was increased, the control scores were higher and the NDVI values were lower. Magnetized water did not affect the biological efficiency of the herbicides, and there was a strong correlation between the control scores and the NDVI values.

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Section: Discussionmentioning

confidence: 63%

Normalized difference vegetation index for desiccation evaluation with glyphosate + 2,4-D in magnetized spray solution

et al. 2023

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“…The environmental conditions during the application of an herbicide may favor or disadvantage several stages of herbicide-plant interaction, highlighting the interception, absorption, and translocation of the product by the plant (CIESLIK et al, 2013;ALMEIDA, 2020). One of the herbicides widely used in nocturnal periods is glyphosate.…”

Section: Introductionmentioning

confidence: 99%

Control of Urochloa brizantha cv. Marandu by Glyphosate and its Interaction with light availability

Mota

Brochado

Aguiar

et al. 2021

RICA

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The use of glyphosate in the desiccation of Urochloa brizantha cv. Marandu is a common practice in Brazilian agriculture; however, the effect of night application in this species is not clearly known. Thus, this study aimed to evaluate the influence of light availability on glyphosate efficiency in the control of U. brizantha. Seven herbicide doses (0, 90, 180, 360, 720, 1,440, and 2,160 g ha-1) in plants submitted to daytime application, followed by 24, 48, or 72 h of dark and night were evaluated. The accumulation of dry matter of U. brizantha, the visual evaluation of injuries, the doses that provided 50 and 80% of control (C50 and C80), and the doses that provided 50 and 80% reduction of dry matter (GR50 and GR80) at 7, 14, 21, 28 days after application (DAA) and at 30 days after cutting (regrowth) were determined. Satisfactory control (>80%) and the absence of regrowth were established from 1,440 g ha-1 in all treatments. However, injury reduction was observed in plants that remained 72 h in the dark relative to daytime treatment in all doses. The highest dose of glyphosate (2,160 g ha-1) reduced U .brizantha by 41, 15, and 3%. For the dose of 1,440 g ha-1 the reduction was 37, 16, and 6%, at 7, 14, and 21 DAA, respectively. The values of GR50 and GR80 decreased from regrowth (37 and 28% less relative to daytime treatment) for plants that were 72 h in the dark. The light favors the behavior of glyphosate in the plant, and therefore this herbicide should not be applied at night for the control of U. brizantha.

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Light availability interferes with absorption and translocation of 14C-glyphosate in Urochloa brizantha cv. Marandu plants

Mota

Mendes

Júnior

et al. 2020

J Radioanal Nucl Chem

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Influence of Glyphosate Concentrations on Spray Solution Physicochemical Characteristics and Drift Potential

Cited by 4 publications

References 32 publications

Normalized difference vegetation index for desiccation evaluation with glyphosate + 2,4-D in magnetized spray solution

Normalized difference vegetation index for desiccation evaluation with glyphosate + 2,4-D in magnetized spray solution

Control of Urochloa brizantha cv. Marandu by Glyphosate and its Interaction with light availability

Light availability interferes with absorption and translocation of 14C-glyphosate in Urochloa brizantha cv. Marandu plants

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