Dinâmica da distribuição e degradação de atrazina em argissolo vermelho-amarelo sob condições de clima tropical úmido

Correia, Fábio Veríssimo; Langenbach, Tomaz

doi:10.1590/s0100-06832006000100018

Cited by 23 publications

(17 citation statements)

References 37 publications

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“…The molecular ** p < 0.01 by the F test. Sorption of oxadiazon in soils cultivated in the Brazilian Cerrado nature of the OM of the soil has been shown to be the key to determine the sorption of nonionic herbicides (Correia & Langenbach, 2006). The molecular OM and its complex structure influence the behavior of fluridone and norflurazon, providing greater sorption (Sun et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

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-The objective of this study was to evaluate oxadiazon sorption in different soils of the Brazilian Cerrado, highlighting the correlations of lethal doses of this herbicide capable of inhibiting 50% of the dry matter accumulation of the bio-indicator (LD50) among the chemical characteristics of the soil and its direct and indirect effects. The experiment was carried out in a greenhouse in a randomized block design and four repetitions. Each experimental unit consisted of a pot with increasing rates of oxadiazon and oat (Avena sativa), as the bio-indicator species. For sorption evaluation, washed sand and 22 soils (substrates) from Cerrado Brazilian's Alliaceae cultivated areas were used. LD50 and sorption ratio (SR) = [(LD50soil -LD50sand)/ LD50sand] to the substrates were determined. Pearson correlation analysis was performed between the chemical characteristics of the substrates and the LD50 of oxadiazon. A path analysis was quantified, to deploy only the significant correlations estimated in direct and indirect effects of the characters on LD50, which is a basic variable. A more pronounced LD50 (528.09 g ha -1 ) for the Cerrado soil sample resulted in higher SR (> 53.00), while in the washed sand substrate, LD50 corresponded only to 9.74 g ha -1 of the oxadiazon (available in soil). It was concluded that oxadiazon sorption is influenced by the chemical characteristics of the soils, highlighting the correlation with pH (CaCl 2 ), magnesium content, aluminum, organic matter, organic carbon, and aluminum saturation.Keywords: bioassay, neutral herbicide, organic matter. RESUMO -Objetivou-se neste estudo avaliar a sorção do oxadiazon em diferentes solos do Cerrado Brasileiro, destacando as correlações da dose letal do herbicida capaz de inibir 50% do acúmulo da massa seca do bioindicador (DL50) entre as características químicas do solo e seus efeitos diretos e indiretos. O experimento foi realizado em casa de vegetação, com delineamento em blocos casualizados com quatro repetições. Cada unidade experimental foi constituída de um vaso com doses crescentes do oxadiazon; utilizou-se a aveia (Avena

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Section: Resultsmentioning

confidence: 99%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

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“…A amostra da coluna foi eluída com 5 mL de água e o volume percolado foi descartado. Posteriormente, foram adicionados 5,0 mL de solução diclorometano:metanol (7:3 v/v), cujo eluato que continha os resíduos foi recolhido em balão volumétrico, concentrado no evaporador rotativo e ressuspendido com 5,0 mL de solução acetonitrila:água (8:2 v/v) para obtenção do extrato de solo (Correia & Langenbach, 2006).…”

Section: Methodsunclassified

Infiltração de atrazina em latossolo submetido aos sistemas de plantio direto e convencional

Correia

Mercante

Fabricio

et al. 2007

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi comparar a lixiviação e o potencial de contaminação de lençóis de água com atrazina, em solos sob manejo de plantio direto (PD) e convencional (PC Infiltration of atrazine in an Oxisol under no-tillage and conventional tillageAbstract -The aim of this work was to compare leaching and potential groundwater contamination in soil under no-tillage and conventional tillage. This experiment was carried out in field conditions and soil columns, using an Oxisol under no-tillage (NT) and conventional tillage (CT) systems in Dourados, MS, Brazil. The determination of the hydraulic conductivity and matrix flux potential, with the use of a Guelph permeameter in the NT, showed a continue flow of water into the soil. Greater conductivity found in the surface soil, associated with the negative matrix flux potential, showed the discontinued hydraulic conductivity, when comparing subsurface layers, in the CT in relation to NT. However, NT resulted in less vertical displacement of atrazine than CT. The largest atrazine losses by leaching occurred more intensely after the first rainfall that followed the product application. Greater atrazine concentrations were retained in NT soil than in CT soil. This resulted in low levels of leaching from the NT soil, which indicates that no-tillage technology can reduce the environmental impact of pesticides.

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“…Sorption can diminish the efficacy of herbicides in the soil, influencing its bioavailability and susceptibility to leaching (YANG;LOGANATHAN et al, 2009). However, molecule retention is reduced in soils with low levels of clay and organic matter, favoring the leaching (FERRI et al 2002;CORREIA;LANGENBACH, 2006;ALLETTO et al, 2010). Also, the pH of quartzarenic neosol (7.8) may have influenced the higher leaching of the herbicide, since Oliveira, Prates and Sans (2005) verified that higher soil pH values reduced herbicide sorption, indicating a reduced residual effect.…”

Section: Residual Effectmentioning

confidence: 99%

Leaching potential and residual effect of amicarbazone in soils of contrasting texture

et al. 2013

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ResumoA infestação de plantas daninhas é um dos principais fatores bióticos presentes no agroecossistema da cana-de-açúcar que têm a capacidade de interferir no desenvolvimento e na produtividade da cultura. O trabalho teve como objetivo avaliar o potencial de lixiviação e efeito residual do herbicida amicarbazone utilizado na cultura da cana-de-açúcar, em solos contrastantes. Para tanto, utilizaramse amostras de Neossolo Quartzarênico (NR -textura arenosa) e Latossolo Vermelho (LR -textura argilosa). No potencial de lixiviação, após a aplicação do herbicida amicarbazone (NR 1,05 kg ha -1 e LR 1,40 kg ha -1 ), foram aplicadas lâminas de 0, 20, 40, 60, 80 e 100 mm de água nas colunas de solos. Avaliou-se o efeito residual, após a permanência do herbicida no solo de textura argilosa e arenosa, por períodos de 0, 25, 50, 75 e 100 dias após a aplicação (DAA) de amicarbazone (0; 1,05; 1,40 kg ha -1 ) nos tratamentos. O amicarbazone apresentou elevada lixiviação a partir da lâmina de 60 mm de água em solos de textura arenosa, constatando menor efeito residual. Em solo argiloso, lâminas de 20 a 80 mm de água reduziram a biomassa até a profundidade de 5-10 cm, com o uso deste herbicida. Com base nos resultados, conclui que o amicarbazone apresentou elevada lixiviação e menor efeito residual em solo arenoso. O efeito residual do amicarbazone foi prolongado conforme o aumento do teor de argila e matéria orgânica presente no solo. Palavras-chave: Impacto ambiental, mobilidade, persistência, retenção AbstractThe infestation of weeds is a major biotic factor in the agroecosystem of cane sugar that may interfere in development and crop productivity. This study aimed to evaluate the potential for leaching and residual effects of the herbicide amicarbazone in contrasting soils. Samples were Quartzarenic Neosol (NR -sandy texture) and Red Latosol (LR -clay texture). For the leaching potential, after application of herbicide amicarbazone (NR 1.05 kg ha -1 and LR 1.40 kg ha -1 ), layers of 0, 20, 40, 60, 80 and 100 mm of water were applied to soil columns. We evaluated the residual effect after the permanence of the herbicide in soil of clay texture and sandy for periods of 0, 25, 50, 75 and 100 days after application (DAA) of amicarbazone (0, 1.05, 1.40 kg ha -1 ) treatments. The amicarbazone started showing high

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Dinâmica da distribuição e degradação de atrazina em argissolo vermelho-amarelo sob condições de clima tropical úmido

Cited by 23 publications

References 37 publications

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

Infiltração de atrazina em latossolo submetido aos sistemas de plantio direto e convencional

Leaching potential and residual effect of amicarbazone in soils of contrasting texture

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