Fatores Ambientais Que Afetam a Eficácia De Glifosato: Síntese Do Conhecimento

Vidal, Ribas Antônio; Pagnoncelli, Fortunato De Bortoli; Fipke, Marcus Vinícius; Queiroz, Andrew Rerison Silva de; Bittencourt, Henrique von Hertwig; Trezzi, Michelangelo Müzell

doi:10.5380/pes.v24i1.39028

Cited by 10 publications

(10 citation statements)

References 44 publications

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“…In this sustainable context, the lowest dose of glyphosate applied in the morning and afternoon, in both investigated volumes, presented satisfactory results and there was no significant difference for the response variables when compared to the other doses used. Vidal et al (2014) corroborate this idea and claim that simply increasing the dose of herbicides has not been the most appropriate procedure to ensure the effectiveness of control. Rodrigues et al (2018) emphasize that the correct dose in burndown can vary according to the species and stage of development.…”

Section: Resultsmentioning

confidence: 83%

Spray volume, dose and time of day of glyphosate application in the control of Urochloa brizantha

Moraes

Ferreira

Souza

et al. 2021

Bioagro

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In order to optimize machinery use, the application of herbicides has been performed at different times of the day and night. Therefore, knowledge about the pesticide that will be used and how the spray volume and time of application affect the effectiveness of the product is very important. Thus, the objective of this work was to study the influence of spray volume and different time of application on the control of Urochloa brizantha by different doses of glyphosate. The treatments were arranged in a 5 x 3 x 2 factorial scheme in a randomized block design with four replications. Five doses of glyphosate (0; 1080; 1440; 1800 and 2160 g∙ha-1∙a.e.), three times of application (morning, afternoon and evening) and two spray volumes (50 and 100 L·ha-1) were evaluated. A control assessment was performed at 21 days after application, in addition to the accumulation of dry matter and the leaf area index on the regrowth. A satisfactory control of the grass was obtained for applications performed in the morning and afternoon, without interference of the volume applied and the doses tested. Evening application reduces the effectiveness of glyphosate in Urochloa brizantha burndown.

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Section: Resultsmentioning

confidence: 83%

Spray volume, dose and time of day of glyphosate application in the control of Urochloa brizantha

Moraes

Ferreira

Souza

et al. 2021

Bioagro

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“…A higher reduction in plant fresh mass was observed when the application occurred at 9 am in relation to 1 am. Daytime applications of glyphosate contribute to better herbicide effectiveness, because to photosynthetic activity and amino acid synthesis pathways being in operation due to the presence of light (Santos Jr et al 2013;Sharkhuu et al 2014;Vidal et al 2014). Applications taken between 9 am and 6 pm provide greater glyphosate efficiency (Martinson et al 2005).…”

Section: Resultsmentioning

confidence: 99%

“…Similar results in various weed species were observed by Zanatta et al (2007) andSilva Jr. et al (2018). The reduction in efficiency occurs due to lower herbicide absorption and translocation due to morphophysiological changes (Vitorino and Martins 2012), such as thickening and composition of epicuticular wax, leaf pilosity, reduced water potential and modification of leaf orientation (Levene and Owen 1995;Vidal et al 2014;Trezzi et al 2020). Different studies have reported that glyphosate is more efficient when applied at 6 am (Mohr et al 2007), and temperatures near to 25 °C (Degreeff et al 2018).…”

Section: Resultsmentioning

confidence: 99%

Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Salomão¹,

Trezzi²,

Pagnoncelli³

et al. 2021

Commun. Plant. Sci.

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Weed management with herbicides requires favorable environmental conditions, that maximize efficiency, such as soil humidity and timing of application. The aim of this study was to assess the effect of the application timing of bentazon and glyphosate herbicides on the control and activity of antioxidant enzymes in Ipomoea grandifolia, under different conditions of soil water availability. Two experiments, one for each herbicide (bentazon and glyphosate), were conducted in a factorial design with four replicates. The first factor was the two rates of each herbicide (504 and 720 g i.a. ha -1 of bentazon and 651 and 911.4 g i.a. ha -1 of glyphosate). The second factor was the six application times (1 am; 5 am; 9 am; 1 pm; 5 pm and 9 pm). The third factor, soil water content (100% and 50% of field capacity). Plus, two controls without herbicide application. At 21 days after application (DAA) of bentazon and 28 DAA of glyphosate, the fresh mass of the aboveground plants was measured. In addition, the activities of the enzymes superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) were determined. For plants under water restriction, an increase of approximately 20% in fresh mass was observed compared in plants without water restriction, indicating lower control efficiency under water stress condition. For bentazon, at 1 pm has been observed the lowest herbicide efficiency, the other times were the most efficient, and did not differ. For glyphosate, the application at 9 am was the most efficient, while at 1 am provided the worst control efficiency. Higher CAT and SOD activities after bentazon application were observed at 1 pm. Among the three enzymes evaluated, SOD presented the highest activity after glyphosate application. Generally, the times of the day with the highest peak of enzymatic activity were distinct between with and without water restriction. Highlighted Conclusions1. Water restriction reduces the efficiency of bentazon and glyphosate. 2. Better efficiency for bentazon was observed at 1 am, 5 am, 9 am, 5 pm and 9 pm. 3. Better efficiency for glyphosate was observed at 9 am.

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“…Para o controle de plantas suscetíveis, destacam-se ainda as diferenças entre as plantas, assim como as condições ambientais no momento da aplicação, por exemplo, devido à sua absorção relativamente lenta, o glyphosate é facilmente influenciado pela ocorrência de chuvas após aplicação (VIDAL et al 2014). Portanto, a dificuldade de controle de plantas do gênero Urochloa pode estar relacionada às características morfológicas, ao estádio de desenvolvimento das plantas durante a aplicação, à grande quantidade de sementes que permanecem no solo formando banco de sementes, além da produção e liberação de compostos alelopáticos por algumas espécies.…”

Section: Resultsunclassified

Determinação da dose de controle de Urochloa decumbens pela aplicação de glyphosate

et al. 2019

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A espécie Urochloa decumbens é uma importante planta daninha de culturas agrícolas devido à alta capacidade adaptativa e dificuldade de manejo. A presença dessas plantas em áreas de produção agrícola pode gerar problemas quando compete por água, luz e nutrientes, além de atuar como hospedeira de pragas e patógenos comuns à cultura e interferir na colheita. O trabalho objetivou avaliar doses de controle de plantas de U. decumbens pela aplicação de glyphosate. Foram realizados três experimentos, em casa de vegetação, em delineamento inteiramente casualizado com seis repetições, contendo entre 50 e 80 plantas por repetição, e oito doses de glyphosate (0; 22,5; 45; 90; 180; 360; 720 e 1440 g ha-1 e.a.). Foram realizadas avaliações visuais de fitotoxicidade aos 0, 7, 14 e 21 dias após a aplicação, e coleta de oito plantas por vaso e por tratamento para determinação de massa seca em cada período avaliado. Para as curvas de resposta, considerou-se a massa seca total, somando todos os períodos coletados, além das plantas remanescentes nos vasos ao término dos experimentos. Plantas de U. decumbens tratadas com 180 g ha-1 e.a. de glyphosate reduziram a massa seca em relação à testemunha, demonstrando maior sensibilidade na aplicação de doses abaixo das recomendadas e utilizadas em campo. Pode-se concluir que a dose 80 g ha-1 e.a. de glyphosate controlou as plantas de U. decumbens, causando fitotoxicidade próxima a 100%, e as doses estimadas entre 30 e 62 g ha-1 e.a. de glyphosate foram capazes de reduzir 50% o crescimento das plantas

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Fatores Ambientais Que Afetam a Eficácia De Glifosato: Síntese Do Conhecimento

Cited by 10 publications

References 44 publications

Spray volume, dose and time of day of glyphosate application in the control of Urochloa brizantha

Spray volume, dose and time of day of glyphosate application in the control of Urochloa brizantha

Control of Ipomoea grandifolia and antioxidant enzyme activity with bentazon and glyphosate at times and soil water conditions

Determinação da dose de controle de Urochloa decumbens pela aplicação de glyphosate

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