Soil Properties Control Glyphosate Sorption in Soils Amended with Birch Wood Biochar

Kumari, Khushbu; Møldrup, Per; Paradelo, Marcos; Elsgaard, Lars; Jonge, Lis Wollesen de

doi:10.1007/s11270-016-2867-2

Cited by 28 publications

(11 citation statements)

References 56 publications

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“…Glyphosate K d values significantly decreased with the increasing concentrations of Olsen P in both SCL-Fe 2 O 3 and CL-CaCO 3 (Figure 1). Glyphosate K d values ranged from 293 to 1173 L kg -1 in the acidic SCL-Fe 2 O 3 soil and from only 99 to 141 L kg -1 in the calcareous CL-CaCO 3 soil ( Figure 1), and these values are within the range of other studies (Farenhorst et al, 2008;Kumari et al, 2016;Sørensen et al, 2006). Long-term application of phosphate fertilizer in soil reduced glyphosate sorption because pre-sorbed phosphate occupied the sorption sites that would otherwise be available to glyphosate .…”

Section: Effect Of Field-aged Phosphate On Sorption Of Glyphosatesupporting

confidence: 69%

Phosphate and glyphosate sorption in soils following long-term phosphate applications

2018

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Phosphate and glyphosate molecules compete for sorption sites in soil. The objective of this study was to quantify the impact of Olsen P concentrations in two contrasting soils on phosphate and glyphosate sorption. Soils were a sandy clay loam soil rich in iron oxides (SCL-Fe 2 O 3) and a clay loam soil rich in calcium carbonates (CL-CaCO 3). The phosphate Freundlich sorption coefficient (K f) ranged from 3 to 68 L 1/n mg 1-1/n kg-1 in the SCL-Fe 2 O 3 and from 21 to 76 L 1/n mg 1-1/n kg-1 in the CL-CaCO 3. Glyphosate sorption coefficient (K d) ranged from 293 to 1173 L kg-1 in the SCL-Fe 2 O 3 but only 99 to 141 L kg-1 in the CL-CaCO 3. Glyphosate K d and phosphate K f values decreased significantly with increasing Olsen P concentrations in both soils. Glyphosate K d values were further significantly reduced when phosphate was added to the slurry solutions, but phosphate K f values were not impacted by the presence of glyphosate in solutions. We conclude that annual phosphate fertilizer applications leave phosphate concentrations in Prairie soils to the extent that soils have a lesser capacity to retain glyphosate and phosphate that are subsequently applied, but glyphosate residues will not influence phosphate sorption.

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Section: Effect Of Field-aged Phosphate On Sorption Of Glyphosatesupporting

confidence: 69%

Phosphate and glyphosate sorption in soils following long-term phosphate applications

2018

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“…Although K d values cannot be directly contrasted across varying experimental conditions, general comparisons can still be of use. The K d values of the 500 °C biochars (Table ) were much lower than those for agronomic soil; however, these partition coefficients were within the same order of magnitude as other studies using 500 °C biochar . The sorption values of the biochars in this study greatly increased at production temperatures of 700 and 900 °C, achieving K d values of up to 216 mL g −1 , which makes these biochars more desirable for direct filtering applications.…”

Section: Resultscontrasting

confidence: 40%

“…The K d values of the 500 ∘ C biochars ( Table 2) were much lower than those for agronomic soil; 27,28 however, these partition coefficients were within the same order of magnitude as other studies using 500 ∘ C biochar. 19 The sorption values of the biochars in this study greatly increased at production temperatures of 700 and 900 ∘ C, achieving K d values of up to 216 mL g −1 , which makes these biochars more desirable for direct filtering applications. However, the highest K d value observed corresponds to a sorption capacity of 0.07 mg g −1 ; thus, significant amounts of material would be required to treat contaminated surface water bodies.…”

Section: Sorption-desorption Summarymentioning

confidence: 82%

“…Hagner et al 7,18 found that biochar prepared from birch wood was successful in reducing the leaching of glyphosate in treated soils, albeit only 1.5% (51 μg L −1 ) of the applied glyphosate was present in the leachate of unamended soil. Kumari et al, 19 again using birch wood biochar, reported enhanced glyphosate sorption in amended soils and demonstrated the importance of soil physicochemical properties in controlling glyphosate sorption capacity. In addition, biochar has been shown to sorb glyphosate from aqueous solution, and efforts to discern sorption mechanisms based on isotherm models and kinetics data suggest a variety of possible interactions, including -electron donor-acceptor interactions, H-bonding and heterogeneous chemisorption through biochar surface functional groups.…”

Section: Introductionmentioning

confidence: 99%

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Glyphosate sorption/desorption on biochars – interactions of physical and chemical processes

Hall

Spokas

Gámiz

et al. 2017

Pest Management Science

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BACKGROUND Biochar, a carbon‐rich product of biomass pyrolysis, could limit glyphosate transport in soil and remediate contaminated water. The present study investigates the sorption/desorption behavior of glyphosate on biochars prepared from different hardwoods at temperatures ranging from 350 to 900 °C to elucidate fundamental mechanisms. RESULTS Glyphosate (1 mg L−1) sorption on biochars increased with pyrolysis temperature and was highest on 900 °C biochars; however, total sorption was low on a mass basis (<0.1 mg g−1). Sorption varied across feedstock materials, and isotherms indicated concentration dependence. Biochars with a greater fraction of micropores exhibited lower sorption capacities, and specific surface groups were also found to be influential. Prepyrolysis treatments with iron and copper, which complex glyphosate in soils, did not alter biochar sorption capacities. Glyphosate did not desorb from biochar with CaCl2 solution; however, up to 86% of the bound glyphosate was released with a K2HPO4 solution. CONCLUSION Results from this study suggest a combined impact of surface chemistry and physical constraints on glyphosate sorption/desorption on biochar. Based on the observed phosphate‐induced desorption of glyphosate, the addition of P‐fertilizer to biochar‐amended soils can remobilize the herbicide and damage non‐target plants; therefore, improved understanding of this risk is necessary. © 2017 Society of Chemical Industry

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“…Some physical processes such as breaking of the structure of biochar by the action of the climate can increase the specific surface area of the biochars [62] and the sorptive capacity of these materials. Kumari et al [63] obtained higher specific surface area and cation exchange capacity (CEC) in soils amended with wood biochar (500°C) after 7-19 months, resulting in increased sorption of glyphosate in all soils of the study. Trigo et al [64] observed an increase in the sorption of metolachlor in soils amended with distinct biochars over the years (macadamia: fresh = 2.4 times, 1 year = 2.5 times, 4 years = 1.9 times, wood: fresh = 2 times, and 5 years = 14 times).…”

Section: Effect Of Biochar Aged On Herbicide Sorption In Soilmentioning

confidence: 84%

Effect of Biochar Amendments on the Sorption and Desorption Herbicides in Agricultural Soil

Mendes¹,

Júnior²,

Takeshita³

et al. 2019

Advanced Sorption Process Applications

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Improved understanding of herbicide destinations, effects, and environmental risks through worldwide studies is crucial to minimizing impacts to nontarget organisms, especially in tropical regions rich in biodiversity. In recent years, there has been widespread international concern about the toxic effects of herbicides on humans, faunas, and native floras. Therefore, the adoption of agricultural practices that minimize the environmental effects of herbicides has been frequently studied, for example, the addition of biochar in agricultural soils. Biochar can be defined as the by-product of a thermal process conducted under low oxygen or oxygen-free conditions (pyrolysis) to convert plant biomass to biofuels, where biochar is the solid product of pyrolysis. The addition of biochar to the soil can easily potentiate the herbicide retention process, which, in addition to contributing positively to the reduction of chemical contaminants in the environment, may exert negative effects on herbicide behavior and the efficacy of these products on weed control. Thus, this chapter will present the general characteristics of biochar, as well as the impact of this material on sorption-desorption of herbicides in the soil.

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Soil Properties Control Glyphosate Sorption in Soils Amended with Birch Wood Biochar

Cited by 28 publications

References 56 publications

Phosphate and glyphosate sorption in soils following long-term phosphate applications

Phosphate and glyphosate sorption in soils following long-term phosphate applications

Glyphosate sorption/desorption on biochars – interactions of physical and chemical processes

Effect of Biochar Amendments on the Sorption and Desorption Herbicides in Agricultural Soil

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