Effects of Incorporated Corn Residues on Glyphosate Mineralization and Sorption in Soil

Accinelli, Cesare; Koskinen, William C.; Seebinger, J.; Vicari, Alberto; Sadowsky, Michael J.

doi:10.1021/jf050186r

Cited by 54 publications

(63 citation statements)

References 27 publications

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“…In soil, no effect of glyphosate was observed on the recovery of A. flavus cfu from soil regardless of rate, formulation or time after treatment. Glyphosate is readily bound by soil colloids and less material would be bioavailable to interfere with growth (Accinelli et al 2005). Indirect effects of the glyphosate cropping system on soil microflora may be responsible for some alterations of A. flavus cfu observed in the field study and altered aflatoxin concentrations in corn grain.…”

Section: Mycotoxin Concentrations In Corn and Cottonmentioning

confidence: 95%

Mycotoxin occurrence andAspergillus flavussoil propagules in a corn and cotton glyphosate-resistant cropping systems

Reddy¹,

Abbas

Zablotowicz³

et al. 2007

Food Additives and Contaminants

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The effects of cotton-corn rotation and glyphosate use on levels of soil-borne Aspergillus flavus, aflatoxin and fumonisin contamination in corn and cotton seed were determined during [2002][2003][2004][2005] in Stoneville, Mississippi (USA). There were four rotation systems (continuous cotton, continuous corn, cotton-corn and corn-cotton) for both glyphosate-resistant (GR) and non-GR cultivars-herbicide system arranged in a randomized complete block design with four replications. Aspergillus flavus populations in surface (5-cm depth) soil, sampled before planting (March/April), mid-season (June) and after harvest (September), ranged from 1.47 to 2.99 log (10) cfu g À1 soil in the four rotation systems. Propagules of A. flavus were higher in the continuous corn system compared to the continuous cotton system on three sample dates, and cotton rotated with corn decreased A. flavus propagules in three of nine sample dates. Propagules of A. flavus were significantly greater in plots with GR cultivars compared to non-GR cultivars in three samples. In cotton seed, aflatoxin and fumonisin levels were similar ( 4 mg kg À1 and non-detectable, respectively) regardless of rotation and glyphosate. In corn grain, aflatoxin was above the regulatory level (!20 mg kg À1 ) only in GR cultivar in 2004 and 2005. Fumonisin was higher in non-GR cultivar (4 mg kg À1) regardless of rotation in 2004; however, in 2002, 2003 and 2005, aflatoxin and fumonisin levels were similar regardless of rotation and glyphosate. These results indicate the potential for increased aflatoxin and fumonisin levels (1 of 4 years) in corn; however, climatic conditions encountered during this study did not allow for mycotoxin production. In laboratory incubation studies, fairly high concentrations of glyphosate were required to inhibit A. flavus growth; however no short-term effect of soil treatment with glyphosate on A. flavus populations were observed. These data suggest that altered populations of A. flavus or higher aflatoxin concentrations in corn grain were due to indirect effects of the GR cropping system.

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Section: Mycotoxin Concentrations In Corn and Cottonmentioning

confidence: 95%

Mycotoxin occurrence andAspergillus flavussoil propagules in a corn and cotton glyphosate-resistant cropping systems

Reddy¹,

Abbas

Zablotowicz³

et al. 2007

Food Additives and Contaminants

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“…This finding is in agreement with the work of Yu and Zhou (2005), who found that the removal of organic matter drastically diminished the CEC of the soils and, consequently, sharply decreased the sorption coefficients. There is a general consensus that a rise in pH negatively affects the sorption of glyphosate (Accinelli et al 2005;Al-Rajab et al 2008;Borggaard and Gimsing 2008;de Jonge and Wollesen de Jonge 1999;Dousset et al 2007;Gimsing et al 2004;Mamy and Barriuso 2005;Mcconnell and Hossner 1985;Xu et al 2009). However, the multiple regression analyses did not detect any influence of pH on Kd eq and Kf variability.…”

Section: Glyphosate Sorption: Mechanisms and Predictionmentioning

confidence: 99%

“…Finally, glyphosate and phosphate have been reported to exhibit similar sorption mechanisms, thereby leading to potential competition for sorption sites (Gimsing and Borggaard 2002). These sorption mechanisms are evidenced by the influence of clay content (Beltran et al 1998;Borggaard and Gimsing 2008;da Cruz et al 2007;Dion et al 2001;Ololade et al 2014;Pessagno et al 2008;Singh et al 2014;Xu et al 2009), iron-and aluminum-oxide content (de Jonge et al 2001;Gimsing et al 2004Gimsing et al , 2007Mamy and Barriuso 2005;Morillo et al 2000;Pessagno et al 2008;Wang et al 2005), pH (Accinelli et al 2005;Al-Rajab et al 2008;Borggaard and Gimsing 2008;da Cruz et al 2007;de Jonge and Wollesen de Jonge 1999;Dousset et al 2007;Gimsing et al 2004;Mamy and Barriuso 2005;Xu et al 2009;Zhou et al 2004), phosphorus content (de Jonge et al 2001;Gimsing and Borggaard 2002), organic carbon (Albers et al 2009;da Cruz et al 2007;Morillo et al 2000;Ololade et al 2014;Pessagno et al 2008;Wang et al 2005) and the cation exchange capacity (CEC) (da Cruz et al 2007;de Jonge and Wollesen de Jonge 1999;Mamy and Barriuso 2005;…”

Section: Introductionmentioning

confidence: 99%

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

2015

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Glyphosate is the most applied herbicide for weed control in agriculture worldwide. Excessive application of glyphosate induces water pollution. The transfer of glyphosate to freshwater and groundwater is largely controlled by glyphosate sorption to soils and sediments. Sorption coefficients are therefore the most sensitive parameters in models used for risk assessment. However, the variations in glyphosate sorption among soils and sediments are poorly understood. Here we review glyphosate sorption parameters and their variation with selected soils and sediment. We use this knowledge to build pedotransfer functions that allow predicting sorption parameters, Kd, Kf and n, for a wide range of soils and sediments. We gathered glyphosate sorption parameters, 101 Kf, n and equivalent Kd, and associated soil properties. These data were then used to perform stepwise multiple regression analyses to build the pedotransfer functions. The linear (Kd) and Freundlich (Kf, n) pedotransfer functions were benchmarked against experimental data. We found the following major points: (1) Under current environmental conditions, sorption is best predicted by the Kd pedotransfer function. (2) The pedotransfer function is Kd = 7.20*CEC -1.31*Clay ? 24.82 (Kd in L kg -1 , CEC in cmol kg -1 and clay in %). (3) Cation exchange capacity (CEC) and clay content are the main drivers of Kd variability across soils and sediments. Freundlich parameters are additionally influenced by pH and organic carbon. This suggests that the formation of complexes between glyphosate phosphonate groups and soil-exchanged polyvalent cations dominates sorption across the range of analyzed soils.

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“…These two herbicides were chosen as models of chemicals which are degraded by a wide number of microorganisms [21,22]. Representative mineralization values of glyphosate and metolachlor, expressed as 14 CO 2 evolution, in water and water/sediment samples are shown in figure 2.…”

Section: Metabolic Potential Of Water Microorganismsmentioning

confidence: 99%

Degradation of the antiviral drug oseltamivir carboxylate in surface water samples

Accinelli

Caracciolo

Grenni

2007

International Journal of Environmental Analytical Chemistry

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Effects of Incorporated Corn Residues on Glyphosate Mineralization and Sorption in Soil

Cited by 54 publications

References 27 publications

Mycotoxin occurrence andAspergillus flavussoil propagules in a corn and cotton glyphosate-resistant cropping systems

Mycotoxin occurrence andAspergillus flavussoil propagules in a corn and cotton glyphosate-resistant cropping systems

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

Degradation of the antiviral drug oseltamivir carboxylate in surface water samples

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