Methodologies to Study the Behavior of Herbicides on Plants and the Soil Using Radioisotopes

Mendes, Kássio Ferreira; Martins, Bianca Assis Barbosa; Reis, Fabrícia Cristina dos; Dias, Ana Carolina; Tornisielo, Valdemar Luiz

doi:10.1590/s0100-83582017350100049

Cited by 14 publications

(10 citation statements)

References 15 publications

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“…The TLC, high‐performance liquid chromatography (HPLC) and gas chromatography (GC) techniques can be used in studies on herbicide metabolism in plants (Mendes et al ., ). In the present study, the TLC technique was used, which presents some advantages such as easy sample preparation and lower cost (Sherma, ).…”

Section: Discussionmentioning

confidence: 97%

Absorption, translocation and metabolism of aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba

Silva

Mendes

et al. 2018

Weed Research

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Members of the Convolvulaceae family are known to be sensitive to aminocyclopyrachlor, although little is known about the absorption, translocation and metabolism of the herbicide in these species of weed. The aim of this study was to evaluate the absorption, translocation and metabolism of 14 C-aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba. Assessments were performed at 3, 6, 12, 24, 48 and 72 h after treatment (HAT) for the study of absorption and translocation. Metabolism was assessed at three time points (3, 24 and 72 HAT). In terms of absorption, was observed a difference between species at the 3 and 48 HAT time points, where I. purpurea had a higher absorption of 14 C-aminocyclopyrachlor. No differences were observed between species at any other time points. Of the total absorbed herbicide, 90.9% for I. purpurea and 91.8% for I. triloba were detected on the treated leaf. I. purpurea presented higher translocation to the leaf above the treated leaf, while I. triloba showed higher translocation to the lower leaves and roots. No increase in absorption of 14 C-aminocyclopyrachlor was observed above 24 HAT for I. purpurea and above 6 HAT for I. triloba, and translocation was low (<1%) for both species in all plant parts. This suggests that post-emergence application of aminocyclopyrachlor cannot be effective for the control of I. purpurea and I. triloba and alternative approaches are required. Nevertheless, no 14 C-aminocyclopyrachlor metabolites were observed in the studied plants, which indicated sensitivity in I. purpurea and I. triloba to the herbicide.

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Section: Discussionmentioning

confidence: 97%

Absorption, translocation and metabolism of aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba

Silva

Mendes

et al. 2018

Weed Research

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“…The applied methodology was described by Mendes et al . (2017). Each experimental unit consisted of a 50‐ml Teflon tube containing 10 ml of the 14 C‐aminocyclopyrachlor solution and 10 g of soil (1:1, m/v).…”

Section: Methodsmentioning

confidence: 99%

“…The desorption study was carried out sequentially to the sorption study, also according to Mendes et al . (2017), discarding the initial solution and adding a further 10 ml of a CaCl 2 solution (0.01 mol/L) to the Teflon tubes. The solution volume retained in the soil between the sorption and desorption steps was considered for desorption percentage calculations.…”

Section: Methodsmentioning

confidence: 99%

Aminocyclopyrachlor sorption–desorption and leaching in soil amended with organic materials from sugar cane cultivation

et al. 2020

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The correct application of a new herbicide depends on knowledge concerning its behaviour within the cultivation system. The objective of this study was to evaluate the sorption–desorption process of aminocyclopyrachlor in soils with the addition of three aged organic materials from sugar cane and their transport via leaching. Sugar cane straw (12 t/ha), filter cake (90 t/ha) and vinasse (200 m3/ha) were added to a clayey soil 15, 30 and 60 days before herbicide application. Sorption and desorption were evaluated by the batch equilibrium method. For leaching assessments, the materials were applied to the soil surface. Sorption was relatively low in all treatments (Kd = 0.17–0.41 L/kg), although significantly higher in soil without organic material addition. A negative correlation between herbicide sorption and increased soil base saturation was observed, indicating competition for sorption sites. With the addition of vinasse, 71% of the herbicide reached the leachate, while <50% reached the leachate in the other treatments. Aminocyclopyrachlor availability was not reduced with organic material addition to the soil, which may be favourable for weed control. However, the presence of vinasse leads to the risk of leaching to deeper soil layers than the seed bank.

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“…LSC analysis was then performed to determine the concentration of the 14 C-herbicides solution, by counting the radioactivity. The amount of herbicide sorption was calculated, using the difference between the initial concentration and the concentration in the supernatant after equilibration (Mendes et al, 2017).…”

Section: Sorption-desorption Studiesmentioning

confidence: 99%

Sorption-desorption isotherms of diuron alone and in a mixture in soils with different physico-chemical properties

Takeshita¹,

Mendes²,

Christoffoleti³

et al. 2019

Afr. J. Agric. Res.

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Herbicide mixture is a widely used weed control practice in many agricultural areas. However, interactions between the herbicide mixture and soil may alter the soil dynamics. This research evaluated the effect of the physicochemical properties of the soils in the application of diuron alone and in a mixture with hexazinone, by means of sorption-desorption Freundlich isotherms. 14 C-diuron sorption (isolated and mixed) was evaluated by batch equilibration at five concentrations of diuron (0.14, 0.16, 0.19, 0.26 and 0.39 μg mL-1) and hexazinone (0.03, 0.06, 0.13, 0.19 and 0.26 μg mL-1), corresponding to the recommended field dose (D) of D/4, D/2, D, 2×D and 4×D, respectively, in five soils cultivated with sugarcane. The sorption of the diuron applied separately and in mixture presented Freundlich sorption coefficient (K f) values in the range of 1.47 to 5.08 and 0.59 to 3.77 µmol (1-1/n) L 1/n kg-1 , respectively. The lowest desorption values were found for Clay-1 soil (72.5% clay), with 6.01 and 5.87% for diuron isolated and blended, respectively. Diuron sorption was slightly higher when applied alone rather than in the herbicide mixture, and this sorption correlated positively with the clay content of the soils, regardless of the application form. The disponibility of diuron improved in mixture of hexazinone in soil, which can increase its absorption and control efficiency; on the other hand, the transport of herbicide can rise. Future researches about the transport, runoff or leaching are required for complete information of the behavior of this mixture of herbicides in soil.

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Methodologies to Study the Behavior of Herbicides on Plants and the Soil Using Radioisotopes

Cited by 14 publications

References 15 publications

Absorption, translocation and metabolism of aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba

Absorption, translocation and metabolism of aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba

Aminocyclopyrachlor sorption–desorption and leaching in soil amended with organic materials from sugar cane cultivation

Sorption-desorption isotherms of diuron alone and in a mixture in soils with different physico-chemical properties

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