Mobilidade Do Sulfentrazone Em Solos Com Diferentes Características Físicas E Químicas

Faustino, L.A.; Freitas, M.A.M.; Passos, Ana Beatriz R. J.; Saraiva, D.T.; Faria, A.T.; Silva, Antônio Alberto da; Ferreira, Lino Roberto

doi:10.1590/s0100-83582015000400018

Cited by 12 publications

(12 citation statements)

References 17 publications

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“…The adsorption of sulfentrazone to the soil is influenced by pH, organic matter and clay content Braga et al, 2016;Teixeira et al, 2017). Soils with lower clay and organic matter levels show high potential for sulfentrazone leaching (Faustino et al, 2015). Sulfentrazone was also applied under preemergence conditions of sunflower in clay soil (77.5% clay) (Brighenti et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

“…However, herbicides with residual effects are an alternative practice in weed control in sunflower fields (Týr & Vavrík, 2015). The dynamics of these herbicides in soils are influenced by various characteristics, such as soil mineralogy, soil texture, moisture content, organic matter and pH Faustino et al, 2015). Thus, studies of herbicide selectivity as a function of specific conditions are necessary to avoid toxicity on sunflower plants and to obtain effective control of the main weed species.…”

Section: Introductionmentioning

confidence: 99%

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Bidens pilosa L. (Asteraceae) control in sunflower with residual herbicides

Brighenti

2019

Com. Sci.

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One of the most damaging species in sunflower crops in Brazil is the hairy beggartick (Bidens pilosa L). The large number of seeds, the various vegetative cycles during the year, the staggered germination and the scarcity of selective and effective herbicides to control this weed in sunflower are some of attributes that hinder the control of hairy beggartick populations. Two experiments were carried out to evaluate the control of hairy beggarticks, as well as sunflower tolerance to herbicides. The treatments were as follows: S-metolachlor (1,200 and 2,400 g ai ha-1), flumioxazin (60 and 120 g ai ha-1), and sulfentrazone (150 and 300 g ai ha-1) and two controls (weedy and weed-free check). The selectivity of the herbicides was higher at low doses. Flumioxazin and sulfentrazone caused injury to sunflowers at the highest doses and mainly in sandy soils. Although S-metolachlor did not cause visual symptoms of injury, the higher dose reduced sunflower yield. The herbicides sulfentrazone and flumioxazin provided satisfactory control of hairy beggartick plants in both types of soils. S-metolachlor presented medium control of hairy beggarticks in clay soil; however, its efficiency was slightly higher when applied in sandy soil. The most efficient herbicide for controlling hairy beggartick plants was flumioxazin, followed by sulfentrazone.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bidens pilosa L. (Asteraceae) control in sunflower with residual herbicides

Brighenti

2019

Com. Sci.

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“…Each fraction was placed in pots without drainage holes with a capacity of 300 cm 3 in which the bioindicator species sorghum (Sorghum bicolor) was planted. This species was used as a bioindicator of sulfentrazone in the soil because it is highly sensitive to the herbicide (Faustino et al, 2015;Silva et al, 2016;Madalão et al, 2017). For this reason, 7 seeds were added to the soil, and three seedlings were left after thinning.…”

Section: Methodsmentioning

confidence: 99%

Leaching and Persistence of Sulfentrazone when Mixed with Adjuvants

et al. 2019

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The objective of this work was to study the influence of adjuvants on leaching and persistence of sulfentrazone in a Red-Yellow Ultisol. The soil was stored in PVC columns of 10 cm diameter and 50 cm length. The treatments were composed of sulfentrazone mixed with six adjuvants (Adesil®, Break-Thru®, Assist®, Hoefix®, Fera® and Nortox® Vegetable Oil), a treatment with sulfentrazone without any adjuvant and a treatment without the herbicide. In the treatments with sulfentrazone, the herbicide was applied at a rate of 1.0 kg ha-1 at the top of the columns, and 12 hours after application, the columns were subjected to simulated rainfall (60 mm). To confirm leaching of sulfentrazone, soil samples were collected every 5 cm up to 50 cm in each column and transferred to 300 cm3 pots to conduct a bioassay using the species Sorghum bicolor. At 21 days after emergence (DAE) of sorghum, visual assessment of intoxication was performed and shoot dry matter percentage was determined. To determine the influence of adjuvants on persistence of sulfentrazone in the soil, new sorghum seeds were planted as soon as the sorghum plants from the first planting were cut; also, phytotoxicity scores were assigned and shoot dry matter was determined at 21 DAE. This procedure was repeated up to 173 days after herbicide application, when the plants showed no more visual symptoms of intoxication. The adjuvant Break-Thru® was effective at reducing leaching of sulfentrazone. The presence of adjuvants applied together with sulfentrazone did not influence the persistence of the herbicide in the study soil. Persistence of sulfentrazone lasted for 143 days.

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“…Another fraction (250g) of each treatment was placed in pots of 300 cm 3 capacity, where the bioindicator Sorghum bicolor was planted. S. bicolor was selected as an indicator of sulfentrazone residues in soil based on several studies (Faustino et al, 2015, Silva Junior et al, 2016, Madalão et al, 2017 that confirmed the high sensitivity of this species to sulfentrazone.…”

Section: Soilmentioning

confidence: 99%

Leaching of sulfentrazone in Brazilian “Cerrado” soils by chromatographic and biological methods

Madalão

Freitas

Tavares

et al. 2017

Agraria

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Sulfentrazone is a mobile herbicide in the soil that can reach groundwater. The objective of this study was to verify the leaching of sulfentrazone in samples from three Brazilian "Cerrado" soils, and compare the biological with the chromatographic method to determine the leaching. The soils were PVC columns (10 cm in diameter x 50 cm in length), 1.5 kg ha -1 of sulfentrazone was applied to the top of the columns. Twelve hours after the application of the herbicide, they were submitted to simulated rainfall (60 mm). To the herbicide leaching, in each column, soil samples were collected every 5 cm, being the experiment mounted in subdivided plots (plots: columns, subplots: depths). From these, a fraction was sent to the laboratory for analysis by high performance liquid chromatography (HPLC). Another fraction was placed in pots, performing bioassay with Sorghum bicolor. Sulfentrazone leached more in treatments Tillage System -Sandy Soil -High acidity and Tillage System -Red Latosol -Low acidity, being quantified by HPLC at depths of 5, 10 and 15 cm and detected in the same depths by bioassay. In treatment, Native Forest -Red Latosol -High acidity the herbicide leached up to 10 cm, also being detected by HPLC and bioassay. The biological method, when compared to the chromatographic, presents good sensitivity to sulfentrazone, being able to be used for leaching study of this herbicide. Lixiviação do sulfentrazone em solos característicos do Cerrado brasileiro pelos métodos cromatográfico e biológico RESUMOSulfentrazone é um herbicida móvel no solo podendo atingir águas subterrâneas. Objetivou-se com este trabalho estudar a lixiviação do sulfentrazone em amostras de três solos do Cerrado brasileiro e comparar o método biológico com o cromatográfico para determinação da lixiviação. Os solos foram acondicionados em colunas de PVC (10 cm de diâmetro x 50 cm de comprimento), foi aplicado 1,5 kg ha -1 de sulfentrazone no topo das colunas. Doze horas após a aplicação do herbicida, essas foram submetidas à chuva simulada (60 mm). Para a confirmação da lixiviação do herbicida em cada coluna, foram coletadas amostras de solo a cada 5 cm, sendo o experimento montado em parcelas subdivididas (parcelas: colunas; subparcelas: profundidades). Dessas, uma fração foi enviada ao laboratório para analise por cromatografia líquida de alta eficiência (CLAE). Outra fração foi colocada em vasos, realizando bioensáio com a espécie Sorghum bicolor. O sulfentrazone lixiviou mais nos tratamentos Plantio direto -Neossolo Quartzarênico -acidez alta e Plantio direto -Latossolo Vermelho -acidez baixa, sendo quantificado por CLAE nas profundidades de 5, 10 e 15 cm e detectado nas mesmas profundidades por bioensaio. No tratamento Mata nativa -Latossolo vermelho -acidez alta o herbicida lixiviou até 10 cm, também sendo detectado por CLAE e pelo método biológico. O método biológico apresenta boa sensibilidade à presença do sulfentrazone, podendo ser utilizado para estudo de lixiviação desse herbicida.Palavras-chave: bioensaio; contaminação ambiental;...

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Mobilidade Do Sulfentrazone Em Solos Com Diferentes Características Físicas E Químicas

Cited by 12 publications

References 17 publications

Bidens pilosa L. (Asteraceae) control in sunflower with residual herbicides

Bidens pilosa L. (Asteraceae) control in sunflower with residual herbicides

Leaching and Persistence of Sulfentrazone when Mixed with Adjuvants

Leaching of sulfentrazone in Brazilian “Cerrado” soils by chromatographic and biological methods

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