Sorption behaviour of oxadiazon in tropical rice soils

Hoque, M. E.; Wilkins, Richard M.; Kennedy, Ann C.; Garratt, James

doi:10.2166/wst.2007.442

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…As already reported by Hoque et al (2007), the oxadiazon sorption by the soil is a rapid process and linearly related to the concentration, depending on the OC content and occurs within two hours.…”

Section: Resultssupporting

confidence: 67%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

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-The objective of this study was to evaluate oxadiazon sorption in different soils of the Brazilian Cerrado, highlighting the correlations of lethal doses of this herbicide capable of inhibiting 50% of the dry matter accumulation of the bio-indicator (LD50) among the chemical characteristics of the soil and its direct and indirect effects. The experiment was carried out in a greenhouse in a randomized block design and four repetitions. Each experimental unit consisted of a pot with increasing rates of oxadiazon and oat (Avena sativa), as the bio-indicator species. For sorption evaluation, washed sand and 22 soils (substrates) from Cerrado Brazilian's Alliaceae cultivated areas were used. LD50 and sorption ratio (SR) = [(LD50soil -LD50sand)/ LD50sand] to the substrates were determined. Pearson correlation analysis was performed between the chemical characteristics of the substrates and the LD50 of oxadiazon. A path analysis was quantified, to deploy only the significant correlations estimated in direct and indirect effects of the characters on LD50, which is a basic variable. A more pronounced LD50 (528.09 g ha -1 ) for the Cerrado soil sample resulted in higher SR (> 53.00), while in the washed sand substrate, LD50 corresponded only to 9.74 g ha -1 of the oxadiazon (available in soil). It was concluded that oxadiazon sorption is influenced by the chemical characteristics of the soils, highlighting the correlation with pH (CaCl 2 ), magnesium content, aluminum, organic matter, organic carbon, and aluminum saturation.Keywords: bioassay, neutral herbicide, organic matter. RESUMO -Objetivou-se neste estudo avaliar a sorção do oxadiazon em diferentes solos do Cerrado Brasileiro, destacando as correlações da dose letal do herbicida capaz de inibir 50% do acúmulo da massa seca do bioindicador (DL50) entre as características químicas do solo e seus efeitos diretos e indiretos. O experimento foi realizado em casa de vegetação, com delineamento em blocos casualizados com quatro repetições. Cada unidade experimental foi constituída de um vaso com doses crescentes do oxadiazon; utilizou-se a aveia (Avena

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Section: Resultssupporting

confidence: 67%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

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“…In general, the lower the solubility of a certain compound, the higher its adsorption [22]. It has been found that soil organic content was the primary factor in oxadiazon adsorption [22,23]. According to Wehtje et al [6], adsorption of oxadiazon in different substrate types was at least 96%.…”

Section: Discussionmentioning

confidence: 99%

“…The authors postulated that these differences were due to the agronomic practices adopted in the second year on lettuce, and in particular, to the frequent irrigations carried out over the season [25]. Despite the low degradation, this herbicide is generally considered with a reduced risk of leaching [4,23,24] and the losses by volatilization are negligible due to its low vapor pressure [2,4,24].…”

Section: Discussionmentioning

confidence: 99%

Oxadiazon Dissipation in Water and Topsoil in Flooded and Dry-Seeded Rice Fields

Milan¹,

Ferrero²,

Fogliatto³

et al. 2019

Agronomy

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The aim of the present study was to assess the behavior of oxadiazon in topsoil and waters of paddy fields cultivated according to the two rice seeding systems: conventional water seeding (CON) and dry seeding (DRY). The study was carried out from 2012 to 2013 in Vercelli, north-west of Italy, the most important rice growing area of Europe. Variations in oxadiazon concentrations were studied over time in topsoil, paddy water, inlet water and outlet water. Over the two years, the estimated oxadiazon topsoil half-life was 3.27 days, without significant differences between systems and years. Oxadiazon dissipation in the paddy water was rapid during the first week, but less pronounced late in the season. Residues of oxadiazon were frequently detected in inlet waters. Transfer of oxadiazon residues in outlet waters occurred over all the growing seasons, with important peaks in the first weeks after the treatment. A possible way to reduce the transfer of oxadiazon to water bodies could be increasing the residence time of the herbicide in the paddy fields during the first 7–10 days after spraying, avoiding the release of water from them.

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“…Other two pesticides from the 1st WL, that is, oxadiazon and tri‐allate, are selective pre‐emergence herbicides. Oxadiazon belongs to the chemical class of oxadiazoles, largely used in rice crops against both mono and dicotyledonous weeds . Tri‐allate (thiocarbamate chemical class) is widely used to control annual and perennial grasses.…”

Section: Characteristics Of the Pesticides From The Eu First And Secomentioning

confidence: 99%

“…Oxadiazon belongs to the chemical class of oxadiazoles, largely used in rice crops against both mono and dicotyledonous weeds. [66] Tri-allate (thiocarbamate chemical class) is widely used to control annual and perennial grasses. Both were included in the 1st WL because of the apparently very high RQ.…”

Section: Metaflumizone Methiocarb Oxadiazon and Tri-allatementioning

confidence: 99%

Pesticides from the EU First and Second Watch Lists in the Water Environment

Pietrzak

Kania

Malina

et al. 2019

CLEAN Soil Air Water

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The contamination of water with pesticides used in agriculture and urban areas is a priority issue that is currently of global concern. In 2015, the European Union (EU) published the first Watch List (1st WL), which showed the necessity for Union‐wide monitoring of ten organic substances/groups of substances in the field of water policy. The list includes, among other items, eight pesticides: five neonicotinoids (acetamiprid, clothianidin, imidacloprid, thiacloprid, and thiamethoxam), and methiocarb, oxadiazon, and tri‐allate. In 2018 the EU published the second Watch List, which repealed the 1st WL. In this list, among other changes, one pesticide (metaflumizone) was added, and two (oxadiazon and tri‐allate) were removed. This review summarizes the current state of knowledge on the reported occurrence and concentrations of these pesticides in surface and groundwaters and in effluents from wastewater treatment plants derived from 73 studies in 21 countries worldwide. Imidacloprid, acetamiprid and thiamethoxam were the most frequently found pesticides due to their widespread use, while metaflumizone, methiocarb, oxadiazon, and tri‐allate are less studied pesticides whose occurrence in water is also poorly reported. More investigation is needed to assess the occurrence and impact of these pesticides on the aquatic environment worldwide in the context of water supply and human security.

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Sorption behaviour of oxadiazon in tropical rice soils

Cited by 7 publications

References 11 publications

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

Oxadiazon Dissipation in Water and Topsoil in Flooded and Dry-Seeded Rice Fields

Pesticides from the EU First and Second Watch Lists in the Water Environment

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