Influence of formulation on mobility of metazachlor in soil

Włodarczyk, Małgorzata

doi:10.1007/s10661-014-3633-9

Cited by 18 publications

(10 citation statements)

References 23 publications

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“…Thus, rains that provide water depths greater than 60 mm can carry the herbicide to deeper layers, and this risk is greater when using Roundup Ready ® or Zapp Qi ® in the mixture, since more herbicide is available in the soil solution. In the present study, rainfall may have been insufficient to reduce sulfentrazone concentration in the upper layers, as higher rainfall intensities may distribute the herbicide in the column (Mueller et al, 2014;Wlodarczyk, 2014).…”

Section: Resultsmentioning

confidence: 77%

Estimation of Sulfentrazone Leaching in Isolated Application and in Mixture with Glyphosate

et al. 2019

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As an alternative to control of resistant biotypes, farmers have resorted to the use of herbicides that have residual soil activity and good pre-emergence action. One of the most used mixtures in Brazil is that of sulfentrazone + glyphosate. When a herbicide has a pre-emergence action, small leaching of its molecules is necessary for its superficial incorporation into the soil, where most of the weed seeds are found. However, if excessive leaching occurs, the herbicide may have reduced efficiency in controlling weed, increasing the risks of groundwater contamination. In this study, sulfentrazone leaching was evaluated in columns with soil, in isolated applications and in mixture with formulations of glyphosate (Roundup Ready®, Roundup Ultra® and Zapp Qi®). For this, the columns were filled with samples of Red-Yellow Latosol, collected in the 0-20 cm depth layer. After moistening the columns to near field capacity, the herbicides were applied to the top and, 24 hours later, a 60 mm rainfall was simulated. After 72 hours, the columns were sectioned in 5 cm segments, collecting the soil from each segment. In these samples, indicator plants (Sorghum bicolor) were cultivated for the presence of the herbicide. It is concluded that, in general, glyphosate does not alter the leaching potential of sulfentrazone in the Red-Yellow Latosol. However, mixtures with Roundup Ready® and Zapp Qi® reduce the sorptive forces of sulfentrazone to soil colloids. Therefore, in some types of soil, herbicide desorption may occur with greater intensity, making its availability in the soil solution more difficult. This may result in better control of plants and/or intoxication of sensitive crops.

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Section: Resultsmentioning

confidence: 77%

Estimation of Sulfentrazone Leaching in Isolated Application and in Mixture with Glyphosate

et al. 2019

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“…It is also efficient in the case of weeds after emergence until the first paid of leaves appear. (Praczyk and Skrzypczak 2004;Włodarczyk 2014). …”

Section: Methodsmentioning

confidence: 99%

“…A natural storage of various organic pollutants in ecosystems, including pesticides, is the organic matter (OM). The adsorption of pesticides by the OM plays an important role by modifying their transport, orientation, bioavailability and toxicity in the natural environment (Aktar et al 2009;Włodarczyk 2014;Włodarczyk and Buchwał 2015). The two processes are responsible for the sorption of xenobiotics by different OM fractions, namely physical and chemical adsorption (Oleszczuk 2007;Ukalska-Jaruga et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Studying of the interaction between peat humic acids and metazachlor using spectroscopy methods

et al. 2018

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Purpose The analysis covered the interaction of humic acids (HA) isolated from peats with the metazachlor using spectroscopic methods. Materials and methods Five peatlands have been selected for the study in the southern and northern parts of Poland. Extraction of humic acids (HA1, HA2, HA3, HA4, and HA5) was performed using a procedure recommended by the International Humic Substances Society. Metazachlor 500 SC with metazachlor as a biologically active substance [2-chloro-N-(pyrazol-1-ylmethyl)acet-2′,6′-xylidide] has been used. HA have been assessed on the basis of their elemental composition. Spectroscopic techniques have been used to study the HA structure and their interaction with metazachlor including: UVvisible spectroscopy, dynamic light scattering, and delayed luminescence (DL) Results and discussion Based on their morphological and chemical properties, the studied peat soils can be classified as follows: (1) Eutric Murshic Sapric Histosols, (2) Eutric Sapric Histosols, (3) Eutric Hemic Histosols, (4) Eutric Fibric Histosols, and (5) Dystric Dranic Hemic Histosols according to the WRB guidelines (2015). Results showed that the largest particle size, measured by E 4/6 coefficient, was found in HA2 sample, while the smallest in HA3 sample. The addition of metazachlor to HA solutions reduced the values of E 4/6 coefficient by 33 to 72%, while the values of hydrodynamic diameter by 4 to 32%. No significant changes were found between E 4/6 after adding of metazachlor to HA solutions. The largest changes in DL intensity, excited both by blue and red light after herbicide addition, were observed in HA2 sample, which is characterized by the largest particle size, the highest oxygen content and CQ value as well as the lowest Baromatization rate^value. Conclusions The particle sizes of HA molecules measured by E 4/6 coefficient do not impact on the particle sizes of HA-herbicide systems measured by the same ratio. The delayed luminescence may become valuable, because it is simple, fast, and sensitive. Additionally, the results show minor errors comparing with chemical methods. This method may provide information about structure and nature of humic acids, as well as their photoreactivity. The using of delayed luminescence in studies of HApesticides interaction may enable us to better understand the luminescence properties of HA.

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“…The formulation and method by which a pesticide is applied influences treatment efficacy, as well as movement after application (Briggs et al, 2002;Derr, 1994). The active ingredient of a pesticide may be incorporated in different forms, such as granules, liquids, or emulsifiable concentrates, where components found within different formulations, including activators, solvents, and adjuvants, impart characteristics to the pesticide, thus influencing mobility in the environment (Wlodarczyk, 2014;Wlodarczyk and Siwek, 2016). Pesticides applied in solid forms will move as solids in water until dissolved, suspensions will move more freely but are typically insoluble, and dissolved pesticides will move freely in water unless adsorbed to soils or organic matter.…”

Section: Application Methods and Formulationmentioning

confidence: 99%

Reducing Water and Pesticide Movement in Nursery Production

Abdi¹,

Fernandez²

2019

hortte

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Ornamental nurseries produce a large number of plants in a concentrated area, and aesthetics are a key component of the product. To produce crops in this manner, high inputs of water, nutrients, and pesticides are typically used. Container nursery production further increases the inputs, especially water, because container substrates are designed to quickly drain, and the most effective method of irrigating large numbers of plants in containers (up to a certain size) is the use of overhead irrigation. Because irrigation and pesticides are broadcast over the crop, and because the crop is limited to the container, a large proportion of water or pesticides may land on nontarget areas, creating runoff contaminant issues. Water is the primary means of pesticide movement in nursery production. This review discusses water and pesticide dynamics and management strategies to conserve water and reduce pesticide and water movement during container nursery production.

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Influence of formulation on mobility of metazachlor in soil

Cited by 18 publications

References 23 publications

Estimation of Sulfentrazone Leaching in Isolated Application and in Mixture with Glyphosate

Estimation of Sulfentrazone Leaching in Isolated Application and in Mixture with Glyphosate

Studying of the interaction between peat humic acids and metazachlor using spectroscopy methods

Reducing Water and Pesticide Movement in Nursery Production

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