Degradação do herbicida sulfentrazone em dois solos de Mato Grosso do Sul

Brum, Camila S.; Franco, A. A.; Júnior, Rômulo Penna Scorza

doi:10.1590/s1415-43662013000500014

Cited by 16 publications

(17 citation statements)

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“…They reported that higher incubation temperatures (30-40 ºC) accelerate molecule degradation, but no effect of soil moisture was found. Brum et al (2013), in turn, found out variable values of sulfentrazone t 1/2 ranging between 34 and 116 days, in different experimental conditions. These authors concluded that soil moisture and incubation temperature influence herbicide persistence, whose degradation occurred more quickly in moist soil (80 % of field capacity) and under high temperature (40 ºC).…”

Section: Resultsmentioning

confidence: 89%

“…These authors concluded that soil moisture and incubation temperature influence herbicide persistence, whose degradation occurred more quickly in moist soil (80 % of field capacity) and under high temperature (40 ºC). Therefore, sulfentrazone dissipation at the environment is suggested to occur primarily by microbial degradation (Ohmes et al 2000, Martinez et al 2010, Rodrigues & Almeida 2011, Brum et al 2013.…”

Section: Resultsmentioning

confidence: 99%

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Bioindicator demonstrates high persistence of sulfentrazone in dry soil1

Lourenço

Carvalho

2015

Pesqui. Agropecu. Trop.

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In sugarcane crop areas, the application of preemergence herbicides with long residual effect in the soil has been frequently necessary. The herbicide persistence in the soil must be high especially because of applications during the dry season of the year, after sugarcane harvest. This study aimed at estimating the sulfentrazone persistence and dissipation in dry soil using bioindicator. Five experiments were carried out, divided into two phases. In the first phase, three dose-response curves were adjusted to select the best bioindicator to be adopted in the second phase. Niger was adopted due to its lower sensibility to sulfentrazone. In the second phase, a new dose-response curve was carried out, with six doses of sulfentrazone, in order to standardize the bioindicator sensibility to sulfentrazone. At the end, another experiment with six periods of sulfentrazone persistence in dry clay soil was developed. Persistence periods were: 182, 154, 125, 98 and 30 days. The bioindicator was seeded at the application day in treated plots and control. In this experiment, the sulfentrazone dose applied was 800 g ha-1. Niger was considered a good species to estimate the sulfentrazone persistence in dry soil. The sulfentrazone phytotoxic activity was identified up to 182 days after application, and its average dissipation rate was 2.15 g ha-1 day-1, with half-life higher than 182 days.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Bioindicator demonstrates high persistence of sulfentrazone in dry soil1

Lourenço

Carvalho

2015

Pesqui. Agropecu. Trop.

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“…Em solo cultivado com cana-de-açúcar, a persistência do sulfentrazone foi de 601 DAA na dose de 0,6 kg ha -1 e 704 DAA na dose de 1,20 kg ha -1 (BLANCO et al, 2010). Sua meia-vida (t½) no solo foi estimada entre 34 e 116 dias em solos do Mato Grosso (BRUM et al, 2013). De acordo com FMC corporation (1995), a t½ do sulfentrazone em solos brasileiros é estimada entre 110 e 280 dias, podendo variar com as condições edafoclimáticas locais.…”

Section: Introductionunclassified

Fitorremediação de solo contaminado com sulfentrazone em função do tempo de cultivo de Canavalia ensiformis

Madalão

Pires

Nascimento

et al. 2016

AGRO@MBIENTE ON-LINE

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Resumo: A fitorremediação é uma alternativa para a descontaminação de áreas que receberam intensas aplicações de herbicidas. Determinar o período mínimo que as espécies devem permanecer remediando o solo é fundamental para a otimização das áreas a serem cultivadas sem riscos de carryover. Objetivouse com este trabalho avaliar o tempo de cultivo de Canavalia ensiformis em solos contaminados com o herbicida sulfentrazone, de modo que essa espécie remedie o solo em níveis satisfatórios. O experimento foi instalado em casa de vegetação, utilizando-se vasos de 10 dm 3 ; e conduzido no delineamento em blocos cazualizados, em esquema fatorial (5 x 2), com quatro repetições. Os fatores consistiram de cinco períodos de fitorremediação, ou seja, de tempos de cultivo da fitorremediadora (0, 25, 50, 75 e 100 dias após a semeadura) e dois níveis de sulfentrazone (com herbicida na dose de 400 g ha -1 e sem herbicida). A espécie bioindicadora foi a Pennisetum glaucum, cultivada por 42 DAS. Ao longo desse período foram avaliadas as seguintes variáveis: altura de plantas (cm); toxicidade visual (%), utilizando escala que varia de 0 a 100, para ausência de sintomas e morte da planta, respectivamente; e matéria seca da parte aérea (g). Com 75 dias de cultivo da espécie fitorremediadora, não houve diferença entre o solo que recebeu aplicação de herbicida e aquele sem aplicação para as variáveis toxicidade visual, altura e matéria seca da parte aérea da espécie bioindicadora. A C. ensiformis precisa ser cultivada por um período mínimo de 75 dias para descontaminar à níveis satisfatórios solos com o sulfentrazone.Palavras-chave: Bioensaio. Descontaminação. Fitotoxicidade. Residual de herbicidas. Abstract:Phytoremediation is an option for the decontamination of areas that have received intensive applications of herbicide. Determining the minimum period that a species should remain for remediation of the soil is critical for the optimisation of areas to be cultivated without the risks of carryover. The aim of this study was to evaluate the cultivation time of Canavalia ensiformis in soil contaminated with the herbicide sulfentrazone, for the species to remediate the soil to satisfactory levels. The experiment was set up in a greenhouse, using 10 dm 3 pots in a randomised block design and a 5 x 2 factorial scheme, with four replications. The factors comprised five periods of phytoremediation, i.e. cultivation times of the green-manure species of phytoremediator (0, 25, 50, 75 and 100 days after sowing -DAS), cultivated both with and without the presence of sulfentrazone (400 g ha -1 ). The species of bio-indicator was Pennisetum glaucum, grown for 42 DAS. During this period the following variables were evaluated: plant height (cm); visual toxicity (%), using a scale from 0 to 100 for the absence of symptoms and death of the plant respectively; and shoot dry matter (g). At 75 days of growth of the phytoremediator species, there was no difference between the soil that received the herbicide application and the soil with no application, f...

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“…Masutti and Mermut (2007) stated that either organic and mineral particles can influence the sorption of fipronil and its degradation products on tropical soils. Another widely used pesticide in sugarcane plantations of Mato Grosso do Sul State is the herbicide sulfentrazone that has shown moderate to high persistence (Brum; and low sorption in tropical soils (Passos et al, 2013). This work had the aim to evaluate the field behavior of fipronil and sulfentrazone after application insugarcane in Dourados, Mato Grosso do Sul State and also to test the PEARL model (Boesten, 2007) to simulate the fate of these two pesticides.…”

Section: Introductionmentioning

confidence: 99%

“…Agrotec., Lavras, v.38, n.5, p.415-423, set./out., 2014 The methods of fipronil and sulfentrazone quantification in soil are described in more details in Brum, Franco and Scorza Júnior (2013) and Scorza . Fipronil and sulfentrazone were extracted by shaking 50 g of moist soil with 100 mL of methanol HPLC grade for 2 hours in a shaking table at 216 rpm and 25°C.…”

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confidence: 99%

Enviromental behavior of sulfentrazone and fipronil in a Brazilian clayey latosol: field experiment and simulation

Júnior

Franco

2014

Ciênc. agrotec.

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There has been an urgent need to assess pesticide environmental behavior under Brazilian field conditions and to evaluate the risks associated to its use in agriculture. Besides a qualitative and quantitative interpretation of field experiments to acquire understanding about pesticide environmental behaviour, field experiments are important to test pesticide fate models. Environmental behaviour of fipronil and sulfentrazone in a sugarcane area in Dourados, MS, was evaluated until 257 days after application. Moreover, the PEARL model was tested to simulate the fate of these two pesticides in the field. Soil samples for pesticide residue quantification and water content were taken at 0-10, 10-30, 30-50, 50-70 and 70-100 cm depth. There was a fast dissipation of both pesticides at soil surface within 15 days after application and their leaching was not beyond 30 cm depth. Dissipation and leaching satisfactory simulations for both pesticides were achieved only after calibration of half-life values or using a reduced initial dose. This study shows that fast dissipation of pesticides in the field can be an important process to consider when assessing the environmental behavior of pesticides in Brazil.Index terms: Leaching, dissipation, PEARL, risk assessment. RESUMOExiste uma necessidade urgente para se avaliar o comportamento ambiental de agrotóxicos nas condições brasileiras de campo e para se avaliar os riscos associados com seu uso na agricultura. Além das interpretações qualitativas e quantitativas dos experimentos de campo para se adquirir entendimento sobre o comportamento ambiental de agrotóxicos, experimentos de campo são importantes para se testar modelos para simular o destino de agrotóxicos. O comportamento ambiental do fipronil e sulfentrazone em uma área com cana-de-açúcar em Dourados, MS, foi avaliado até 257 dias após aplicação. Mais ainda, o modelo PEARL foi testado para simular o destino desses dois agrotóxicos no campo. Amostras de solo para a quantificação dos resíduos dos agrotóxicos e do teor de água foram coletadas nas profundidades de 0-10, 10-30, 30-50, 50-70 e 70-100 cm. Houve uma rápida dissipação de ambos os agrotóxicos na superfície do solo em 15 dias após aplicação e suas lixiviações não foram além de 30 cm de profundidade. Simulações satisfatórias da dissipação e lixiviação para ambos os agrotóxicos foram obtidas somente após calibração dos valores de meia-vida ou utilizando a dose inicial reduzida. Nste trabalho, mostra-se que a rápida dissipação de agrotóxicos no campo pode ser um processo importante a ser considerado na avaliação do comportamento ambiental de agrotóxicos no Brasil.Termos para indexação: Lixiviação, dissipação, PEARL, avaliação de risco.

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Degradação do herbicida sulfentrazone em dois solos de Mato Grosso do Sul

Cited by 16 publications

References 17 publications

Bioindicator demonstrates high persistence of sulfentrazone in dry soil1

Bioindicator demonstrates high persistence of sulfentrazone in dry soil1

Fitorremediação de solo contaminado com sulfentrazone em função do tempo de cultivo de Canavalia ensiformis

Enviromental behavior of sulfentrazone and fipronil in a Brazilian clayey latosol: field experiment and simulation

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