Organic amendments affecting sorption, leaching and dissipation of fungicides in soils

Fernandes, Maria C.; Cox, Linda J.; Hermosı́n, M.C.; Cornejo, J.

doi:10.1002/ps.1303

Cited by 62 publications

(51 citation statements)

References 31 publications

(42 reference statements)

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“…Data revealed that adsorption of flubendiamide (Table 4) was higher in organic manure-treated soil than without organic manure-treated soil. Similar results were reported by Fernandes et al (2006). The dynamics of pesticides in soil was greatly affected by the varying physical and chemical properties of the soil, especially the organic matter and clay content as reported by Li et al (2003), Gajbhiye and Gupta (2001) and Beyer et al (1996).…”

Section: Resultssupporting

confidence: 90%

Effect of soil type and organic manure on adsorption–desorption of flubendiamide

Das

Mukherjee

Kumar

2015

Environ Monit Assess

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Laboratory study on adsorption-desorption of flubendiamide was conducted in two soil types, varying in their physical and chemical properties, by batch equilibrium method. After 4 h of equilibrium time, adsorption of flubendiamide on soil matrix exhibited moderately low rate of accumulation with 4.52 ± 0.21% in red soil and low rate with 3.55 ± 0.21% in black soil. After amending soils with organic manure, adsorption percentage increased to 6.42 ± 0.21% in red soil and (4.18 ± 0.21%) in black soil indicating that amendment significantly increased sorption. Variation in sorption affinities of the soils as indicated by distribution coefficient (K d) for sorption was in the range of 2.98-4.32, 4.91-6.64, 1.04-1.45 and 1.92-2.81 ml/g for red soil, organic manure-treated red soil, black soil and organic manure-treated black soil, respectively. Desorption was slightly slower than adsorption indicating a hysteresis effect having hysteresis coefficient ranges between 0.023 and 0.149 in two test soils. The adsorption data for the insecticide fitted well the Freundlich equation. Results revealed that adsorption-desorption was influenced by soil types and showed that the maximum sorption and minimum desorption of the insecticide was observed in soils with higher organic carbon and clay content. It can be inferred that crystal lattice of the clay soil plays a significant role in flubendiamide adsorption and desorption. Adsorption was lower at acidic pH and gradually increased towards alkaline pH. As this insecticide is poorly sorbed in the two Indian soil types, there may be a possibility of their leaching to lower soil profiles.

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Section: Resultssupporting

confidence: 90%

Effect of soil type and organic manure on adsorption–desorption of flubendiamide

Das

Mukherjee

Kumar

2015

Environ Monit Assess

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“…The dynamics of pesticides in soil was greatly influenced by the varying physical and chemical properties of the soil, especially the organic matter and clay content (Li et al 2003). The data reveals that adsorption of tricyclazole (Table 3) was high in FYM-amended soils than without amendment, and similar results were reported by Fernandes et al (2006). The increase in adsorption percent of tricyclazole in amended soils may be related to the adsorption of the tricyclazole to the soil by increasing the available sorption sites.…”

Section: Resultssupporting

confidence: 86%

Adsorption–desorption of tricyclazole: effect of soil types and organic matter

Kumar

Mukherjee

Varghese

2015

Environ Monit Assess

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Adsorption-desorption of tricyclazole was studied by batch equilibrium method in two soil types, varying in their physical and chemical properties. The adsorption of tricyclazole on the soil matrix exhibited low rate of accumulation with 18.24 ± 0.14 % in Ultisol and moderately high rate with 43.62 ± 0.14 % in Vertisol after 6 h of equilibrium time. For soils amended with farmyard manure (FYM), the adsorption percentage increased to 32.52 ± 0.14 % in Ultisol and 55.14 ± 0.14 % in Vertisol. The Freundlich model was used to describe the adsorption-desorption of the tricyclazole in two soils. The adsorption isotherm suggested a relatively higher affinity of tricyclazole to the adsorption sites at low equilibrium concentrations. Variation in sorption affinities of the soils as indicated by the distribution coefficient (K d) for sorption in the range of 0.78 ± 0.01-1.38 ± 0.03, 1.71 ± 0.03-2.99 ± 0.09, 2.75 ± 0.05-4.69 ± 0.01, and 4.65 ± 0.08-7.64 ± 0.01 mL/g for Ultisol, FYM-amended Ultisol, Vertisol, and FYM-amended Vertisol, respectively. Desorption was slower than adsorption, indicating a hysteresis effect. The hysteresis coefficient varied from 0.023 ± 0.15 to 0.160 ± 0.12 in two test soils. A good fit to the linear and Freundlich isotherms was observed with correlation coefficients >0.96. The results revealed that adsorption-desorption was influenced by soil properties and showed that the maximum sorption and minimum desorption of pesticide were observed in soils with higher organic carbon and clay content. Thus, groundwater contamination may be minimized, on application of tricyclazole in high-sorption soils of rice-growing regions.

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“…The main structural consequence is the progressive contraction of the allophane aggregates associated with closure of the mesopores. In the literature (Fernandes et al 2006), it has been shown that adding organic matter reduced soil porosity, mainly via a reduction in the largest pore size studied (10-100 μm). Similar results were obtained by Albarran et al (2004).…”

Section: Change In Soil Porosity During the Incubation Of Organic Mattermentioning

confidence: 99%

Compost addition reduces porosity and chlordecone transfer in soil microstructure

Woignier

Clostre²,

Fernandes³

et al. 2015

Environ Sci Pollut Res

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Chlordecone, an organochlorine insecticide, pollutes soils and contaminates crops and water resources and is biomagnified by food chains. As chlordecone is partly trapped in the soil, one possible alternative to decontamination may be to increase its containment in the soil, thereby reducing its diffusion into the environment. Containing the pesticide in the soil could be achieved by adding compost because the pollutant has an affinity for organic matter. We hypothesized that adding compost would also change soil porosity, as well as transport and containment of the pesticide. We measured the pore features and studied the nanoscale structure to assess the effect of adding compost on soil microstructure. We simulated changes in the transport properties (hydraulic conductivity and diffusion) associated with changes in porosity. During compost incubation, the clay microstructure collapsed due to capillary stresses. Simulated data showed that the hydraulic conductivity and diffusion coefficient were reduced by 95 and 70% in the clay microstructure, respectively. Reduced transport properties affected pesticide mobility and thus helped reduce its transfer from the soil to water and to the crop. We propose that the containment effect is due not only to the high affinity of chlordecone for soil organic matter but also to a trapping mechanism in the soil porosity.

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Organic amendments affecting sorption, leaching and dissipation of fungicides in soils

Cited by 62 publications

References 31 publications

Effect of soil type and organic manure on adsorption–desorption of flubendiamide

Effect of soil type and organic manure on adsorption–desorption of flubendiamide

Adsorption–desorption of tricyclazole: effect of soil types and organic matter

Compost addition reduces porosity and chlordecone transfer in soil microstructure

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