Modification to Imazaquin Degradation in Soil Amended with Farm Manure

Wang, Huili; Li, Yanyan; Wang, Xuedong

doi:10.1080/15320380701741354

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…Our study also found that fertilizers applied at a normal field dose inhibited the dissipation of fipronil. Two other studies have reported that organic fertilizers accelerate the degradation of flubendiamide and imazaquin 50,51 …”

Section: Resultsmentioning

confidence: 96%

“…Two other studies have reported that organic fertilizers accelerate the degradation of flubendiamide and imazaquin. 50,51 Pesticide degradation commonly occurs via microbial aerobic degradation. 19,[23][24][25][26] In this study, the soil bacterial abundance and microbial communities were evaluated using the Shannon index, Chao 1 index, and microbial abundance analysis (Figs 2 and 3).…”

Section: Effect Of Fertilizers On Fipronil Dissipation In Soilmentioning

confidence: 99%

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Effect of fertilization on the degradation and enantioselectivity of fipronil in soil

Zhang,

et al. 2023

Pest Management Science

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BackgroundFertilizers and pesticides are commonly used simultaneously in agriculture. However, the effects of common fertilizers on the dissipation, enantioselectivity, and metabolites of the chiral insecticide fipronil in soil are yet to be reported.ResultAn enantioselective method for detecting fipronil enantiomers and their metabolites in different soil matrices was developed using ultra‐performance liquid chromatography‐tandem mass spectrometry (UPLC‐MS/MS). The results showed that organic and compound fertilizers significantly decreased the degradation of S‐ and R‐fipronil, whereas phosphatic and microbial fertilizers slightly reduced fipronil dissipation. The half‐life values for S‐ and R‐fipronil were 43.3 and 28.9 d, 99.0 and 63.0 d, 69.3 and 43.3 d, 46.2 and 30.1 d, and 43.3 and 31.5 d, respectively, in the control and the four fertilizer treatments, respectively. The enantioselectivity of fipronil enantiomers occurred and R‐fipronil exhibited preferential degradation with an enantiomeric fraction (EF) of 0.4900‐0.6238 in all treatments; But the four tested fertilizers decreased enantioselectivity with EF values changed from 0.4970‐0.6238 in the control to 0.4900‐0.6171 in fertilizer treatments. Two metabolites, fipronil sulfone and sulfide, were produced, and their amounts increased with culture time in all treatments. Fertilization reduced the content of fipronil sulfide and sulfone but hardly reduced the total amount of fipronil and its metabolites.ConclusionFertilizers affect the environmental behavior of fipronil in the soil. Fertilization alters the soil bacterial community, which may be an important factor. This influence is relatively complicated and should be comprehensively considered in the environmental risk assessment of pesticides.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 96%

Section: Effect Of Fertilizers On Fipronil Dissipation In Soilmentioning

confidence: 99%

Effect of fertilization on the degradation and enantioselectivity of fipronil in soil

Zhang,

et al. 2023

Pest Management Science

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“…However, there is no specific relationship between the organic mat content and imidazolinone degradation based on this dataset, as shown in Figure 6. Sin a higher organic matter content tends to favor microbiological activity in the soil, Wan et al [43] evaluated its effect by incorporating 10% cattle manure into the soil, which In addition to soil texture, the organic matter content can also determine herbicide availability [42]. However, there is no specific relationship between the organic mat-ter content and imidazolinone degradation based on this dataset, as shown in Figure 6.…”

Section: 𝑡 = 𝑙𝑛 𝑙𝑛 2 𝑘mentioning

confidence: 99%

“…However, there is no specific relationship between the organic mat-ter content and imidazolinone degradation based on this dataset, as shown in Figure 6. Since a higher organic matter content tends to favor microbiological activity in the soil, Wang, et al [43] evaluated its effect by incorporating 10% cattle manure into the soil, which reduced the half-life of imazaquin from 21 to nine days.…”

Section: 𝑡 = 𝑙𝑛 𝑙𝑛 2 𝑘mentioning

confidence: 99%

Understanding the Opportunities to Mitigate Carryover of Imidazolinone Herbicides in Lowland Rice

et al. 2021

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(1) Background: The Clearfield™ system (CL) is currently the primary tool for selective weedy-rice management in irrigated rice. However, herbicide persistence in the soil may cause damage to successive crops. Thus, it is necessary to understand agricultural practices that can favor the dissipation of these herbicides. The objective of this study was to analyze the factors that affect the persistence of imidazolinones and to use this information to provide management strategies to mitigate carryover in lowland rice. (2) Methods: A literature review was performed, and the publications were selected using the soil half-life parameter. The data were summarized according to the biotic conditions, soil parameters, and environmental variables. (3) Results: Imidazolinone dissipation in soil occurs primarily through biodegradation. The herbicide biodegradation rate depends on environmental conditions such as temperature and bioavailability of the herbicide in the soil. Herbicide bioavailability is affected by soil conditions, with higher bioavailability in soil with higher pH, less clayey texture, moderate organic matter content, and higher soil moisture levels. Therefore, environmental conditions that favor biological activity, especially high temperatures, reduce the herbicide half-life in the soil. Strategies to mitigate carryover should focus on improving herbicide availability and enhancing biological activity in the soil, especially in the rice off-season, when low temperatures limit herbicide biodegradation. Cover and rotational crops, such as ryegrass and soybean, are recommended, with the potential to mitigate soil residues. (4) Conclusions: The establishment of crops other than rice would automatically enhance degradation rates as soil amendment practices such as pH correction and drainage practices would favor soil availability and biological activity.

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“…The herbicide dissipated slightly faster in the sandy loam soil (soil 2) than in the clay soil (soil 1) ( Figure 3, Table 1). The degradation of imazaquin in soils has been mainly attributed to photodegradation and biological degradation (Ramezani et al, 2008;Wang et al, 2007b). In this work, the dissipation experiments were carried out in the dark, so that biodegradation may have been the major dissipation route for imazaquin.…”

Section: Dissipation In Unamended Soilsmentioning

confidence: 99%

Behavior of the enantiomers of the herbicide imazaquin in agricultural soils under different application regimes

et al. 2017

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Sorption, persistence, and leaching of the enantiomers of the herbicide imazaquin, S-imazaquin and R-imazaquin, in two soils under different application regimes were studied. Imazaquin dissipation was evaluated after a single application of the racemic herbicide and the pure enantiomers, and after a repeated application of the racemic herbicide. The effects of adding two olive-mill wastes (ALP and ALPc), biochar (BC), and organoclay (SA-HDTMA) on sorption, dissipation, and leaching of imazaquin enantiomers applied as racemic herbicide to the soils was also evaluated. For all treatments, sorption, dissipation, and leaching of imazaquin in the soils were either non-enantioselective or scarcely enantioselective. No interconversion of Rimazaquin to S-imazaquin or vice-versa was observed in the experiments with the pure isomers. Addition of ALP, ALPc, or BC did not enhance the negligible sorption of imazaquin enantiomers by the soils, but accelerated their dissipation. Addition of SA-HDTMA increased sorption of both enantiomers and delayed their dissipation and leaching. The results illustrate how agricultural practices can impact the behavior of imazaquin enantiomers in soils and support the suitability of replacing currently used racemic formulations of imazaquin with formulations based on the single biologically-active (R) enantiomer to reduce the environmental impact of this chiral pesticide.

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Modification to Imazaquin Degradation in Soil Amended with Farm Manure

Cited by 5 publications

References 16 publications

Effect of fertilization on the degradation and enantioselectivity of fipronil in soil

Effect of fertilization on the degradation and enantioselectivity of fipronil in soil

Understanding the Opportunities to Mitigate Carryover of Imidazolinone Herbicides in Lowland Rice

Behavior of the enantiomers of the herbicide imazaquin in agricultural soils under different application regimes

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