Sorption−Desorption of Aminocyclopyrachlor in Selected Brazilian Soils

Oliveira, Rubem Silvério de; Alonso, Diego Gonçalves; Koskinen, William C.

doi:10.1021/jf104992w

Cited by 30 publications

(33 citation statements)

References 12 publications

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“…An average aminocyclopyrachlor concentration of 20 mg kg 21 (10% of applied) remained in the top 5 cm across all soil types (Figures 3a and 3b). This is similar to aminocyclopyrachlor desorption observed in 17 different soil types which ranged from sandy to clay textures (Oliveira et al 2011(Oliveira et al , 2013. Approximately 208 mg kg 21 (32% of applied) of quinclorac was retained in the top 5 cm across all soil types (Figures 2a and 2b).…”

Section: Resultssupporting

confidence: 72%

“…Aminocyclopyrachlor is more weakly adsorbed to soil surfaces and has a higher leaching potential (Oliveira et al 2011(Oliveira et al , 2013 compared with quinclorac which may have accounted for this difference. Herbicide sorption coefficient (K oc ) values of 446 and 28 for quinclorac and aminocyclopyrachlor, respectively (Hill et al 2000;Shaner 2014a), also support this hypothesis.…”

Section: Resultsmentioning

confidence: 99%

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Quinclorac and Aminocyclopyrachlor Movement in Sandy Soils

Adams

Lym

2015

Invasive plant sci. manag.

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The Sheyenne National Grassland (SNG) is a native tall grass and mixed grass prairie located in southeastern North Dakota. Approximately half of the SNG has been invaded by leafy spurge (Euphorbia esulaL.) and control methods have been limited. Many herbicides cannot be utilized at the SNG due to sandy soils (> 80%) and shallow groundwater, nor can they be applied near the western prairie fringed orchid (Platanthera praeclaraSheviak and Bowles), a federally listed threatened plant found on the SNG. Quinclorac and aminocyclopyrachlor were considered for use on the SNG but potential to enter the groundwater was unclear. Movement of quinclorac and aminocyclopyrachlor was evaluated in 70 cm soil columns that simulated field conditions from five ecological sites. Quinclorac leached further following the heavy rainfall event of 15 cm in 48 h compared to the annual precipitation of 51 cm applied over 9 wk. Quinclorac leached approximately 45 cm into the soil profile averaged over all soil types and both precipitation events but never exceeded 65 cm regardless of soil type. Aminocyclopyrachlor leaching was greater than quinclorac and moved through all soil types into the leachate following both watering regimes. Desorption of both herbicides was incomplete. Approximately 10 and 32% of applied aminocyclopyrachlor and quinclorac, respectively, remained in the top 5 cm of soil regardless of soil type or watering regime. Quinclorac but not aminocyclopyrachlor was considered suitable for use at the SNG to control leafy spurge and has the added benefit of not harming the western prairie fringed orchid.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Quinclorac and Aminocyclopyrachlor Movement in Sandy Soils

Adams

Lym

2015

Invasive plant sci. manag.

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“…Myers & Parker (2011) also noted a long period of residual activity (between three and five months) for species like Eclipta alba, Euphorbia maculata and Senecio vulgaris. Alonso et al (2011) found a positive correlation between the sorption indaziflam and organic carbon content of several Brazilian soils, and classified this herbicide as moderate potential for leaching in the soil profile.…”

Section: Introductionmentioning

confidence: 83%

Sensibility of plant species to herbicides aminocyclopyrachlor and indaziflam

et al. 2014

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-Aminocyclopyrachlor and indaziflam are under development in Brazil and there is no information about their behavior in Brazilian soils. This study aimed to evaluate the sensitivity of plant species to these new molecules, trying to select plants that can be used as bioindicators for testing the behavior of these herbicides in the soil. Two experiments were conducted, one for each herbicide. The treatments were arranged in a 8 x 6 factorial design, the factors being represented by eight species used as bioindicators -cotton, maize, soybean, sorghum, sunflower, millet, cucumber and beet, and six doses of herbicides (aminocyclopyrachlor -0, 10 , 20, 30 , 40 and 50 g ha ). Among the species studied, soybean and beet were quite sensitive to the two new herbicide molecules, being great alternatives for bioassays in order to detect low concentrations of aminocyclopyrachlor and indaziflam in the soil.Keywords: beet, bioassay, I 50 , soybean. -algodão, milho, soja, sorgo, girassol, milheto, pepino e beterraba e seis doses dos herbicidas (aminocyclopyrachlor -0; 10; 20; 30; 40 RESUMO -O aminocyclopyrachlor e indaziflam encontram-se em fase de desenvolvimento no Brasil e não existem informações a respeito do comportamento destes em solos brasileiros. Este trabalho teve como objetivo avaliar a sensibilidade de espécies vegetais à estas novas moléculas, buscando selecionar plantas que possam ser utilizadas como bioindicadores em ensaios de comportamento destes herbicidas no solo. Foram conduzidos dois experimentos um para cada herbicida. Os tratamentos foram dispostos em esquema fatorial 8 x 6, sendo os fatores representados por oito espécies utilizadas como bioindicadoras

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“…It is used in the US since 2010 to control broadleaf weeds and brushes in non-crops areas such as lawns (residential, industrial, and institutional), golf courses, parks, cemeteries, athletic fields, and sod farms [1] and is currently under development in Brazil for the cultivation of sugarcane and pasture [2,3]. Although limited information is known about aminocyclopyrachlor fate in soil, studies reported that this herbicide is highly water soluble, non-volatile, and can be easily leached in soils due to its low sorption capacity and high desorption capacity [4,5]. Its dissipation in the environment is thus expected to occur predominantly via aqueous photolysis and leaching becoming a potential groundwater contaminant [6].…”

Section: Introductionmentioning

confidence: 99%

Soil Factors Effects on the Mineralization, Extractable Residue, and Bound Residue Formation of Aminocyclopyrachlor in Three Tropical Soils

et al. 2017

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Abstract:Aminocyclopyrachlor is an herbicide that belongs to the new class of chemicals known as the pyrimidine carboxylic acids, which are used to control broadleaf weeds and brush. However, the environmental behavior and fate of aminocyclopyrachlor are not fully understood. The aim of the present study was thus to evaluate the mineralization, extractable residue and bound residue formation of aminocyclopyrachlor in three tropical soils with different physico-chemical properties. 14 C-labeled [pyrimidine-2-14 C] aminocyclopyrachlor was used to assess the fate of this herbicide in soil placed in biometer culture flasks. Total mineralization (accumulated 14 CO 2 ) of aminocyclopyrachlor was found to be <10% in all soils, decreasing in the following order: Oxisol-Typic Hapludox (clay) > Oxisol-Typic Hapludox (loamy sand) > Plinthosol-Petric (sandy clay). Overall, constant rate of mineralization (k) values for all soils were very low (0.00050% to 0.00079% 14 CO 2 day −1 ), with mineralization half-life times (MT50) consequently very high (877 to 1376 days), suggesting potential long persistence in soil. The amount of extractable residues decreased from~31% to 50% in all soils after 126 days of incubation, indicating an increase in bound residue formation from~5.0-to 7.5-fold compared to evaluation immediately after herbicide application, suggesting that degradation herbicide is involved in the formation of bound residues. Extractable residues are important factors that control mineralization and bound residue formation from aminocyclopyrachlor in the soil. The present study is the first to assess the fate, distribution, and formation of bound residues of aminocyclopyrachlor in soils. Aminocyclopyrachlor residues were predominantly associated with the OM and clay contents of soil. This effect of soil physico-chemical properties should be considered in environmental risk assessment of aminocyclopyrachlor and its application in the field for weed control.

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Sorption−Desorption of Aminocyclopyrachlor in Selected Brazilian Soils

Cited by 30 publications

References 12 publications

Quinclorac and Aminocyclopyrachlor Movement in Sandy Soils

Quinclorac and Aminocyclopyrachlor Movement in Sandy Soils

Sensibility of plant species to herbicides aminocyclopyrachlor and indaziflam

Soil Factors Effects on the Mineralization, Extractable Residue, and Bound Residue Formation of Aminocyclopyrachlor in Three Tropical Soils

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