Amitrole degradation in vineyard soils in relation to pedo-climatic conditions

Dakhel, Nathalie; Barriuso, Enrique; Charnay, Marie-Paule; Touratier, Christine; Ambrosi, Dominique

doi:10.1007/s003740100357

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Similar results were observed by Dakhel et al (2001) on amitrole degradation in eight soils with different textures. Day et al (1961) also showed a faster degradation rate of amitrole in a fine-textured than a coarse-textured soil.…”

Section: Soil Texturesupporting

confidence: 88%

Organic Amendments to Enhance Atrazine and Metamitron Degradation in Two Contaminated Soils with Contrasting Textures

Forouzangohar

Haghnia

Koocheki

2005

Soil and Sediment Contamination: An International Journal

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Among all types of xenobiotics, pesticides such as herbicides play a significant role in soil and water pollution due to their wide usage all over the world. This study addresses the ability of organic amendments to enhance atrazine and metamitron degradation in two herbicide-contaminated soils with contrasting textures under laboratory conditions. Soil samples were collected from surface soils with textures of sandy loam and silty clay, from northeastern Iran. Initial concentration of herbicides was 50 mg · kg −1 soil. Contaminated soil samples were treated with manure, compost and vermicompost at rates of 0, 0.5, and 2% (w/w). Residual concentrations of atrazine and metamitron were determined by HPLC at the end of incubation periods of 20, 40, and 60 days. Residual concentrations of atrazine were 46.5, 38.9, and 36.2 mg · kg −1 after 20, 40, and 60 days incubation, respectively. Residual metamitron concentrations were clearly lower than atrazine. After 20, 40, and 60 days, concentrations of metamitron were 2.9, 1.0, and 0.6 mg · kg −1 , respectively. Organic amendments at the rates of 0.5 and 2% showed similar effects on the enhancement of herbicide degradation in soils. However, no statistically significant effect was observed among types of organic amendments (α = 0.05). Degradation was affected by soil textures. Residual concentrations of herbicides were higher in sandy loam than in silty clay soil.

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Section: Soil Texturesupporting

confidence: 88%

Organic Amendments to Enhance Atrazine and Metamitron Degradation in Two Contaminated Soils with Contrasting Textures

Forouzangohar

Haghnia

Koocheki

2005

Soil and Sediment Contamination: An International Journal

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“…6). Differences between soils in both degradation potential for natural and synthetic compounds and in enzyme activity often are seen [28,[30][31][32][33]. Also, degradation rates and enzyme activity often are higher in clayey soils compared with those in sandy soils, possibly because the clayey soils are more nutrient rich and, hence, may support a higher microbial population or because extracellular enzymes are stabilized by adsorption to clay minerals Degradation of glucosinolates in soil Environ.…”

Section: Degradation Kineticsmentioning

confidence: 99%

Degradation kinetics of glucosinolates in soil

Gimsing¹,

Sørensen²,

Tovgaard³

et al. 2006

Enviro Toxic and Chemistry

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Glucosinolates are compounds produced by all cruciferous plants. They can be hydrolyzed to several biologically active compounds and, as such, may serve as naturally produced pesticides. To optimize the pesticidal (biofumigation) effect and to assess the risk of glucosinolate leaching and spread in the environment, the degradation in soil of glucosinolates has been studied. The kinetics of degradation of four glucosinolates, two aliphatic (but-3-enyl and 2-hydroxy-but-3-enyl) and two aromatic (benzyl and phenethyl), in four soils was largely independent of the specific glucosinolate structure. Degradation followed logistic kinetics. Degradation was much faster in a clayey soil (half-life, 3.5-6.8 h) than in a sandy soil (half-life, 9.2-15.5 h). Degradation was much slower or nonexistent in the subsoil (<25 cm soil depth). The glucosinolates are not sorbed in the soil, and the degradation potential is, to a large extent, associated with the clay fraction. Measured activity in the soils of the enzyme myrosinase, which can catalyze the hydrolysis of glucosinolates, correlated well with the glucosinolate degradation kinetics. Autoclaving, but not sodium azide or gamma-irradiation, effectively blocked glucosinolate degradation, indicating that extracellular myrosinase is important for glucosinolate degradation.

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