Influence of surface and subsurface soil properties on atrazine sorption and degradation

Jenks, B. M.; Roeth, Fred W.; Martin, Alex; McCallister, Dennis L.

doi:10.1017/s0043174500090299

Cited by 78 publications

(80 citation statements)

References 24 publications

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“…Atrazine and simazine are weak acid herbicides that are more stable at higher pH levels (Ladlie et al, 1976). The protonation of triazines increases under alkaline soils and enhances the potential for plant uptake from soils with higher acidity ( Jenks et al, 1998;Dombek et al, 2001). Best and Weber (1974) found plant uptake and leaching of 14 C-atrazine was greater at a 7.5 pH than at 5.5.…”

Section: Roots Shoots Total Roots Shoots Totalmentioning

confidence: 99%

Physiological Basis for Triazine Herbicide Tolerance in Bermudagrass, Seashore Paspalum, and Zoysiagrass

2015

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Atrazine and simazine control weeds in warm‐season turfgrasses, but excessive injury limits applications to sensitive species. The objective of this research was to evaluate the physiological basis for differential tolerances of bermudagrass (Cynodon dactylon (L.) Pers.), seashore paspalum (Paspalum vaginatum Sw.), and zoysiagrass (Zoysia japonica Steud.) to atrazine and simazine. In greenhouse experiments, hierarchical shoot mass reductions from the nontreated by species were: seashore paspalum > bermudagrass > zoysiagrass for atrazine and seashore paspalum > bermudagrass = zoysiagrass for simazine. Atrazine and simazine treatments to soil only or foliar plus soil reduced shoot mass similarly, averaging 45% from nontreated, while foliar‐only treatments reduced shoot mass 22% from the nontreated. Species rank for root absorption of both herbicides after 48 h from high to low was seashore paspalum > bermudagrass > zoysiagrass. All species had acropetal translocation of 14C‐atrazine and 14C‐simazine, but bermudagrass and zoysiagrass translocated ∼10% more 14C than seashore paspalum after 48 h. Hierarchical species rank for nonmetabolized 14C‐atrazine translocation to shoots after 8 h from high to low was seashore paspalum > bermudagrass > zoysiagrass. All species metabolized 14C‐atrazine to hydroxyatrazine and two unidentified metabolites in root and shoots. All species metabolized simazine to hydroxysimazine and two other metabolites in shoots. Seashore paspalum had less total metabolism of 14C‐simazine than bermudagrass and zoysiagrass and produced fewer metabolites in roots. Results suggest bermudagrass and seashore paspalum susceptibility to atrazine is associated with greater absorption and translocation of the parent herbicide to shoots than zoysiagrass. Seashore paspalum susceptibility to injury from simazine is associated with differences in absorption and metabolism from tolerant turfgrasses bermudagrass and zoysiagrass.

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Section: Roots Shoots Total Roots Shoots Totalmentioning

confidence: 99%

Physiological Basis for Triazine Herbicide Tolerance in Bermudagrass, Seashore Paspalum, and Zoysiagrass

2015

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“…[3][4][5][6][7][8][9] In Parana´(a southern state of Brazil), herbicide sales amount to 250 million US $ a year. Research carried out in other countries shows that these soil properties may influence the major mechanisms controlling the fate of herbicides in the environment.…”

Section: Introductionmentioning

confidence: 99%

Sorption Kinetics of Atrazine and Diuron in Soils from Southern Brazil

Inoue

Oliveira

Regitano³

et al. 2004

Journal of Environmental Science and Health, Part B

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Sorption kinetics of atrazine and diuron was evaluated in soil samples from a typical landscape in Paraná. Samples were collected (0-20 cm) in a no-tillage area from Mamborê, PR, which has been cultivated under a crop rotation for the last six years. Six sampling points of the slope were selected to represent a wide range of soil chemical and physical properties found in this area. Radiolabeled tracers (14C-atrazine and 14C-diuron) were used and the radioactivity was detected by liquid scintillation counting (LSC). Sorption was accomplished for increasing equilibration periods (0.5, 1.5, 3, 6, 12, 24, and 48 h). Kinetics data fitted adequately well to Elovich equation, providing evidences that soil reaction occurs in two distinct stages: a fast, initial one followed by a slower one. During the fast phase, 34-42 and 71-79% of total atrazine and diuron applied were sorbed to soil samples. No important differences were found among combinations of soil and herbicide sorption during the slow phase. The unrealistic conditions under batch experiments should be overestimating sorption in the fast phase and underestimating diffusion in the slow phase. Sorption of both herbicides was positively correlated to organic carbon and clay contents of soils, but atrazine was much less sorbed than diuron, showing its higher potential to contaminate groundwater, specially in sandy, low organic carbon soils.

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“…Variations in soil properties with depth influence sorption, degradation, and movement of herbicides [17]. Understanding how soil properties within a profile affect herbicide retention and degradation will result in more accurate prediction of herbicide fate and potential groundwater contamination.…”

Section: Introductionmentioning

confidence: 99%

Atrazine and Metribuzin Sorption in Soils of the Argentinean Humid Pampas

Dániel

Bedmar

Costa

et al. 2002

Environ Toxicol Chem

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Laboratory studies were conducted to determine the influence of surface and subsurface properties of three representative soils of the humid pampas of Argentina on atrazine and metribuzin sorption. Atrazine and metribuzin sorption isotherms were constructed for each soil at four depths. Sorption affinity of herbicides was approximated by the Freundlich constant (K(f)), distribution coefficient (Kd), and the normalized Kd based on organic carbon content (K(oc)). Multiple regression of the sorption constants against selected soil properties indicated that organic carbon content (OC) and silt were related positively and negatively, respectively, to atrazine K(f) coefficient (r2 = 0.93), while Kd coefficient of atrazine was related positively to organic carbon content and negatively to both silt and cation exchange capacity (CEC) (r2 = 0.96). For metribuzin, only organic matter content was related positively to Kr coefficient (r2 = 0.51). Lower K(f) values for atrazine were obtained for all soils with increasing depth, indicating lesser sorption at greater depths. Metribuzin sorption was quite similar across all depths. Sorption constant K(f) of atrazine ranged from 2.06 to 7.82, while metribuzin K(f) values ranged from 1.8 to 3.52 and were lower than atrazine for all soils and depths, indicating a greater leaching potential across the soil profile.

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Influence of surface and subsurface soil properties on atrazine sorption and degradation

Cited by 78 publications

References 24 publications

Physiological Basis for Triazine Herbicide Tolerance in Bermudagrass, Seashore Paspalum, and Zoysiagrass

Physiological Basis for Triazine Herbicide Tolerance in Bermudagrass, Seashore Paspalum, and Zoysiagrass

Sorption Kinetics of Atrazine and Diuron in Soils from Southern Brazil

Atrazine and Metribuzin Sorption in Soils of the Argentinean Humid Pampas

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