A proposal to standardize soil/solution herbicide distribution coefficients

Weber, J. B.; Wilkerson, Gail G.; Linker, H; Wilcut, John W.; Leidy, R. B.; Senseman, Scott A.; Witt, William W.; Barrett, Michael; Vencill, William K.; Shaw, David R.; Mueller, Thomas C.; Miller, Donnie K.; Brecke, Barry J.; Talbert, Ronald E.; Peeper, Thomas F.

doi:10.1614/0043-1745(2000)048[0075:aptsss]2.0.co;2

Cited by 46 publications

(41 citation statements)

References 25 publications

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“…Clean tap water was served as the control. The recommended dose (2 mg l −1 ) was calculated assuming that: 1) no adsorption of the pesticide occurs in the soil colloids; 2) the moisture content of the soil is at field capacity, which for a sandy loam soil ranges between 15 and 24% (20% was assumed); and 3) pesticide residues are contained within the top 15 cm of the surface soil (Weber et al 2000). According to these assumptions, the expected concentration of QL in soil solution, when the maximum recommended dose has been applied, was calculated to be 2 mg l −1 .…”

Section: Methodsmentioning

confidence: 99%

Efficacy of a formulated product containing Quillaja saponaria plant extracts for the control of root-knot nematodes

Giannakou

2011

Eur J Plant Pathol

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The nematicidal effect of a formulated product containing extract from Quillaja saponaria was evaluated against the root-knot nematodes. The product QL Agri® 35 (QL) was tested to record the effect on second stage juveniles motility, egg hatch and also against field populations in greenhouse experiments contacted in three different locations of Greece. Convulsive movement of second stage juveniles of Meloidogyne incognita was recorded after exposure for 8 days at a series of doses, while the most paralyzed juveniles were counted at the dose of 8 mg l −1 . There was also a gradual decrease in the number of juveniles emerging from egg masses of the same nematode species when the dose of Q. saponaria was increased from 0 to 8 mg l −1 . In greenhouse experiments, the use of Q. saponaria could control root-knot nematodes and prevent nematodes increase in soil. The present study demonstrates that the use of Q. saponaria extract has the ability to control root-knot nematodes. Control given by Q. saponaria in field populations infecting cucumber was similar to that of cadusafos (Rugby®) and oxamyl (Vydate®) under the tested dosages and the specific conditions of the experiments.

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Section: Methodsmentioning

confidence: 99%

Efficacy of a formulated product containing Quillaja saponaria plant extracts for the control of root-knot nematodes

Giannakou

2011

Eur J Plant Pathol

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“…A batch equilibration method was used to determine terbuthylazine adsorption-desorption (Weber et al 2000) in organic amendment-treated and untreated soils.…”

Section: Adsorption-desorption Experimentsmentioning

confidence: 99%

Sorption of the herbicide terbuthylazine in two New Zealand forest soils amended with biosolids and biochars

et al. 2009

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Background, aim, and scope Terbuthylazine is one of the most commonly used herbicides for vegetation management in forest plantations in New Zealand. Knowledge about the sorption of terbuthylazine on forest soils, especially the influence of coexisting organic amendments, remains obscure. In this study, we evaluated the effects of biosolids and biochars on the sorption of terbuthylazine to forest soils. Materials and methods Two pumice soils, including a forest landing site soil with low soil organic matter content and an organic carbon rich topsoil under standard forest management, were sampled from a 2-year-old replanted pine plantation. The soils were mixed with four organic amendments, including two thermally dried biosolids with one digested and the other undigested, a biochar produced from high temperature pyrolysis (700°C), and a biochar from pyrolysis with a lower temperature (approximately 350°C). A batch equilibration method was used to determine terbuthylazine adsorption-desorption in organic amendment-treated and untreated soils. Adsorption and desorption isotherms were described with the Freundlich equation.Results and discussion Adsorption and desorption isotherms in the soils with or without organic amendments were well described by the Freundlich model. The undigested or digested biosolids added to the topsoil had a negligible or limited effect on the adsorption to terbuthylazine. The addition of the other amendments to the two soils all enhanced the adsorption. The biochars displayed higher efficiency in improving soils' adsorption capacity to terbuthylazine than the biosolids. Among the organic amendments evaluated, the biochar obtained from high temperature pyrolysis demonstrated the most significant enhancement on adsorption with an enhancing factor of 63; whereas, the digested biosolids showed the weakest enhancement. Furthermore, terbuthylazine adsorbed by the digested biosolids appeared to be more easily desorbed than that by biochar treatments. Conclusions This work indicates that the addition of organic amendments to forest soils, particularly biochar to a soil with low native organic matter, may enhance soil sorption of terbuthylazine and thus reduce the possibility of the hydrophobic herbicide leaching to groundwater.

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“…In agriculture it is commonly applied in the dose of 1-2.5 kg/ha, which represents 3.3-8.2 mg/l MCPA in the soil solution (under assumption that sufficient rainfall rises the water content in soil up to 20% vol. to the depth of 15 cm) (Weber et al 2000).…”

Section: Methodsmentioning

confidence: 99%

Laboratory study of retention and release of weak acid herbicide MCPA by soils and sediments and leaching potential of MCPA

Hiller¹,

Khun²,

Zemanová³

et al. 2006

PLANT SOIL ENVIRON

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MCPA sorption and desorption in five surface soils (denoted as A1-5), three bottom sediments (S1-3), two river sediments (L1-2) and one subsurface soil (SS) at two initial concentrations in aqueous solution -C 0 = 0.5 and 10 mg/l were studied. No significant effect of the initial concentration on MCPA equilibrium distribution between soil/sediment and aqueous solution was observed. The difference between distribution coefficient K D at C 0 = 0.5 mg/l and K D at C 0 = 10 mg/l was found only in the case of one bottom sediment (S2). A simple regression analysis between K D at C 0 = 0.5 and 10 mg/l and soil/sediment properties indicated that the most important property which determined the variation in MCPA sorption is organic carbon (r = 0.886*** and r = 0.926***, respectively). Similarly, desorption of MCPA was inversely proportional to organic carbon content of the soils and sediments used (r = -0.862* and r = -0.842**). These observations showed that MCPA sorption and desorption in soils and sediments were primarily controlled by organic components of the geosorbents used. Overall, the percentage of MCPA sorption in soils and sediments was low (P sorp ≈ 3-53%; K D = 0.077-2.827 l/kg) and the percentage of MCPA desorbed was relatively high (P des ≈ 11-70%), especially in the soils and sediments with lower organic carbon content. The experimental results and calculated values of groundwater ubiquity score GUS and relative leaching potential index RLPI imply that MCPA is very mobile in all the surface soils and has a potential to contaminate groundwater.

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A proposal to standardize soil/solution herbicide distribution coefficients

Cited by 46 publications

References 25 publications

Efficacy of a formulated product containing Quillaja saponaria plant extracts for the control of root-knot nematodes

Efficacy of a formulated product containing Quillaja saponaria plant extracts for the control of root-knot nematodes

Sorption of the herbicide terbuthylazine in two New Zealand forest soils amended with biosolids and biochars

Laboratory study of retention and release of weak acid herbicide MCPA by soils and sediments and leaching potential of MCPA

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