Sulfentrazone Dissipation in a Tennessee Soil<sup>1</sup>

Ohmes, G. Anthony; Hayes, Robert M.; Mueller, Thomas C.

doi:10.1614/0890-037x(2000)014[0100:sdiats]2.0.co;2

Cited by 52 publications

(72 citation statements)

References 12 publications

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“…Thus HMS was shown to be one of the components in the metabolic degradation route of this herbicide by microorganisms in soil. Ohmes et al (25) showed that microbial degradation is an important mechanism for sulfentrazone dissipation, since its degradation was very low in autoclaved soils.…”

Section: Discussionmentioning

confidence: 99%

Microbial degradation of sulfentrazone in a Brazilian rhodic hapludox soil

Martínez¹,

Silva²,

Fay³

et al. 2010

Braz. J. Microbiol.

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Sulfentrazone is amongst the most widely used herbicides for treating the main crops in the State of São Paulo, Brazil, but few studies are available on the biotransformation of this compound in Brazilian soils.Soil samples of Rhodic Hapludox soil were supplemented with sulfentrazone (0.7 µg active ingredient (a.i.) g -1 soil) and maintained at 27ºC. The soil moisture content was corrected to 30, 70 or 100 % water holding capacity (WHC) and maintained constant until the end of the experimental period. Herbicide-free soil samples were used as controls. Another experiment was carried out using soil samples maintained at a constant moisture content of 70% WHC, supplemented or otherwise with the herbicide, and submitted to different temperatures of 15, 30 and 40º C. In both experiments, aliquots were removed after various incubation periods for the quantitative analysis of sulfentrazone residues by gas chromatography.Herbicide-degrading microorganisms were isolated and identified. After 120 days a significant effect on herbicide degradation was observed for the factor of temperature, degradation being higher at 30 and 40º C. A half-life of 91.6 days was estimated at 27º C and 70 % WHC. The soil moisture content did not significantly affect sulfentrazone degradation and the microorganisms identified as potential sulfentrazone degraders were Nocardia brasiliensis and Penicillium sp. The present study enhanced the prospects for future studies on the bio-prospecting for microbial populations related to the degradation of sulfentrazone, and may also contribute to the development of strategies for the bioremediation of sulfentrazone-polluted soils.

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Section: Discussionmentioning

confidence: 99%

Microbial degradation of sulfentrazone in a Brazilian rhodic hapludox soil

Martínez¹,

Silva²,

Fay³

et al. 2010

Braz. J. Microbiol.

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“…Uma possível explicação para essa tendência de maior degradação em condição de maior umidade pode estar relacionada ao fato da umidade ter uma influência direta sobre a proliferação dos micro-organismos degradadores e suas atividades (Martinez et al, 2008). A degradação microbiana é um mecanismo importante na degradação do sulfentrazone no solo uma vez que Ohmes et al (2000) observaram que a degradação foi muito lenta em solos autoclavados.…”

Section: Methodsunclassified

“…Ohmes et al (2000) observaram, avaliando a degradação do sulfentrazone nessa mesma temperatura, semelhantemente, uma degradação mais rápida do sulfentrazone (93 dias) em solo de superfície (profundidade de 0-10 cm) quando comparada à degradação observada (102 dias) em solo de subsuperfície (profundidade de 30-40 cm).…”

Section: Methodsunclassified

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

Brum

Franco

Júnior

2013

Rev. bras. eng. agríc. ambient.

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RESUMORealizou-se este trabalho com o objetivo de avaliar a degradação do herbicida sulfentrazone em dois solos (Latossolo Vermelho Distroférrico típico e Neossolo Quartzarênico Órtico típico) utilizados na cultura da cana-de-açúcar, em Mato Grosso do Sul, e avaliar também a influência da temperatura, umidade e profundidade na taxa de degradação. Os experimentos de degradação foram realizados utilizando-se solos incubados em diferentes condições de umidade (50 e 80% da capacidade de campo -CC), temperatura (30 e 40 ºC) e profundidade (0-30 e 50-70 cm). Os resultados das concentrações remanescentes do sulfentrazone no solo foram, em função do tempo, ajustados aos modelos de cinética de primeira ordem (SFO) e ao de cinética de primeira ordem para multicompartimentos (FOMC). O sulfentrazone foi menos persistente em condições de maior umidade (80% da CC), temperatura mais elevada (40 ºC) e em horizontes superficiais do solo (0-30 cm). A degradação do sulfentrazone para a maioria das condições estudadas foi melhor descrita pelo modelo FOMC. Os valores de meia-vida para o sulfentrazone nas diferentes condições de umidade, temperatura e profundidades avaliadas, variaram de 34 a 116 dias. Palavras-chave: meia-vida, persistência, cana-de-açúcar, agrotóxicosDegradation of sulfentrazone herbicide in two soils of Mato Grosso do Sul State ABSTRACT This study had the aim to evaluate sulfentrazone degradation in two soils (distroferric red Latossol and orthic quartzarenic Neosol) used for sugarcane production in Mato Grosso do Sul State and also to evaluate the influence of temperature, moisture and soil depth in the sulfentrazone degradation rates. Experiments were carried out using incubated soils at different soil moistures (50 and 80% field capacity -FC), temperatures (30 and 40 °C) and depths (0-30 and 50-70 cm). Remaining sulfentrazone concentrations in soil as a function of time were adjusted to single first-order kinetics model (SFO) and also to the first-order multi-compartment kinetic model (FOMC). Sulfentrazone was less persistent in conditions of high soil moisture (80% FC), high temperature (40 °C) and in the topsoil (0-30 cm depth). Sulfentrazone degradation was best described by FOMC model. Half-life values of sulfentrazone evaluated at different conditions of moisture, temperature and soil depths ranged from 34 to 116 days.

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“…Sulfentrazone is a weak acid with a pKa of 6.56; therefore, it exists predominantly in ionized form in soils with a pH higher than the pKa (Senseman 2007). Sulfentrazone is relatively persistent in soil, with a half-life reported in the range of 24 to 302 days (FMC Corporation 1999;Martinez et al 2008;Ohmes et al 2000). Because of slow sulfentrazone dissipation in some soils especially under conditions of drought and cool weather, a potential risk of carry-over to rotational crops is of concern.…”

Section: Introductionmentioning

confidence: 99%