Adsorption, Desorption, and Degradation of Three Pesticides in Different Soils

Zheng, S.Q.; Zheng, J.-F. Cooper S.-Q.

doi:10.1007/s002449900003

Cited by 16 publications

(25 citation statements)

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“…Cadusafos was the most persistent nematicide compared with fenamiphos, fosthiazate and oxamyl (Giannakou et al, 2005). The present studies agree with previous work where a first order dissipation kinetics has been reported for cadusafos (Meher & Agnihotri, 1990;Zheng & Cooper, 1996;Meher et al, 2005) carbosulfan (Tariq et al, 2006); triazophos (Sunita Rani et al, 2001;Vig et al, 2001) in soil and water, with temperature and moisture significantly influencing their persistence in soil (Meher & Agnihotri, 1990;Tariq et al, 2006). Involvement of microorganisms for rapid degradation of the test nematicides in previously treated soil was confirmed by inhibiting degradation of the nematicides by soil sterilisation.…”

Section: Discussionsupporting

confidence: 92%

Nematicidal efficacy, enhanced degradation and cross adaptation of carbosulfan, cadusafos and triazophos under tropical conditions

Meher

Gajbhiye

Singh

et al. 2010

Nematol

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Nematicides need to be applied in each cropping season but repetitive applications can reduce their persistence and efficacy due to the unpredictable phenomena of enhanced biotransformation and cross adaptation. Experiments were conducted to ascertain the number of times the nematicides carbosulfan, cadusafos and triazophos can be applied effectively in the field. Incubation studies checked their degradation rates and cross adaptation and bioassays assessed their efficacy against Meloidogyne incognita infecting Solanum lycopersicum. Monitoring nematode populations at the middle of seven consecutive tomato crops following nematicidal treatments at a recommendable rate of 1.0 kg a.s. ha −1 revealed a linear decrease in efficacy with successive seasons. The chemicals remained effective up to the fourth application when 53-62% reduction of M. incognita in soil was still achievable, which decreased significantly to 14-33% by the seventh application. The nematicides were more effective against endoparasitic (M. incognita and Rotylenchulus reniformis) than ectoparasitic (Helicotylenchus dihystera, Hoplolaimus indicus and Tylenchorhynchus vulgaris) nematodes. Bioassays revealed 13-18% more invasions of second-stage juveniles of M. incognita into roots of tomato grown in soil pre-treated seven times with nematicide than in similar soil with no history of nematicide use; invasion and soil population were positively correlated. Root galling of field-grown tomato increased from the first to the seventh application. In bioassays, tomato root galling was greater in unsterilised field soil (1.4-2.1) than in similar soil/sterilised soil (1.0) compared with 2.4-2.9 in untreated control soil. The decrease in efficacy was attributable to accelerated microbial degradation of nematicides due to repeated use in each cropping season. Carbosulfan, cadusafos and triazophos exhibited a half-life (t 1/2 ) of 14, 20 and 27 days in soil with no history of nematicide use, whereas the t 1/2 was 6, 13 and 9 days in soil pre-treated seven times with nematicides and 28, 28 and 32 days in unsterilised soil, respectively. In cross adaptation studies, carbosulfan exhibited a t 1/2 of 7-9 days in soil pre-treated seven times with cadusafos and triazophos. The t 1/2 of cadusafos (22 days) was not affected in carbosulfan-treated soil but was affected (13 days) in triazophos-treated soil. Triazophos had a t 1/2 of 20 days in carbosulfan-treated soil and a t 1/2 of 8 days in cadusafos-treated soil. These results indicate that carbosulfan, cadusafos and triazophos can be applied effectively to the same field at least four times without decrease in efficacy due to accelerated biotransformation. Rotation of nematicide from different groups can be used in long-term nematode management strategies to avoid accelerated degradation and/or cross adaptation.

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Section: Discussionsupporting

confidence: 92%

Nematicidal efficacy, enhanced degradation and cross adaptation of carbosulfan, cadusafos and triazophos under tropical conditions

Meher

Gajbhiye

Singh

et al. 2010

Nematol

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“…In the different soil types, other factors such as the nature of major cations bound to soil organic matter [28], the interaction between organic matter and mineral constituents [29], or soil pH [30] can influence pesticide sorption. Indeed, sorption of cadusafos was found to show no correlation with the soil organic content [4]. The results of Olvera et al [25] suggest that soil organic matter had a less important role in the sorption of cadusafos on soils.…”

Section: Adsorption Equilibriummentioning

confidence: 96%

“…It is applied as a pre-planting application which is incorporated into the 10-15 cm of the surface soil. Adsorption, desorption and degradation of cadusafos were evaluated under laboratory conditions with six soils selected in a tropical zone (Martinique, French west Indies) and in the Mediterranean area (Languedoc, South of France) [4]. The results did not correlate sorption of cadusafos with soil organic matter content, and showed that cadusafos exhibits a moderate tendency to leaching.…”

Section: Introductionmentioning

confidence: 98%

Kinetics and thermodynamics of adsorption of cadusafos on soils

ElShafei

Nasr

Hassan

et al. 2009

Journal of Hazardous Materials

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“…Dissipation of 50% of metolachlor ranged from 85 to >106 d (Burgard et al 1993). Increased sorption of metolachlor in soil has been positively correlated with clay (Bossetto et al 1994;Zheng and Cooper 1996) and organic matter con-tent (Kozak et al 1983). Increased sorption of metolachlor in soil has been positively correlated with clay (Bossetto et al 1994;Zheng and Cooper 1996) and organic matter con-tent (Kozak et al 1983).…”

Section: Introductionmentioning

confidence: 91%

Leaching behavior of metolachlor in soil

El‐Nahhal¹

2004

Journal of Environmental Engineering and Science

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This work estimated the leaching behavior of metolachlor from montmorillonite-based and commercial emulsifiable concentrate (EC) formulations in soil columns and field plots by using bioassay and chemical techniques. A montmorillonite-based formulation of metolachlor was prepared by adsorbing metolachlor to montmorillonitebenzyltrimethylammonium (BTMA) complex from aqueous solution. Bioassay and gas chromatography (GC) techniques detected high metolachlor concentrations in the top soil layers (0-9 cm) in soil columns and field plots sprayed with montmorillonite-BTMA-metolachlor complex. These results were also evident by severe growth inhibition restricted to the top soil layers (0-9 cm) and normal growth at deeper layers in soil columns and field plots. A wider range of metolachlor concentrations were detected in soil layers in columns treated with EC formulation in both soil columns and field plots. Relatively higher metolachlor concentrations were detected in the soil layers in field plots than in soil columns. A bioassay technique was a more sensitive tool than chemical technique and detected diluted concentration of metolachlor at deeper layers. The different leaching behavior of metolachlor applied as montmorillonite-BTMA complex is due to the adsorption capacity of montmorillonite-BTMA complex.Résumé : Ce travail estime la lixiviation du métolachlore de formulations à base de montmorillonite et de concentré émulsionnable industriel dans les colonnes de sols et des parcelles expérimentales en utilisant des techniques chimiques et des essais biologiques. Une formulation de métolachlore à base de montmorillonite a été préparée en adsorbant le métolachlore sur un complexe de montmorillonite-benzyltriméthylammonium (BTMA) dans une solution aqueuse. Les essais biologiques et les techniques de chromatographie en phase gazeuse ont détecté de fortes concentrations de métolachlore dans les couches de sol supérieures (0-9 cm) dans les colonnes de sol et les parcelles expérimentales parsemées avec un complexe montmorillonite-BTMA-métolachlore. Ces résultats étaient également évidents par la grave inhibition de croissance dans les couches de sol supérieures (0-9 cm) et la croissance normale dans les couches plus profondes des colonnes de sol et des parcelles expérimentales. Une plus grande plage de concentrations de métolachlore a été détectée dans les couches de sol des colonnes traitées avec une formulation de concentré émulsionnable. Des concentrations relativement plus élevées de métolachlore ont été détectées dans les couches de sol des parcelles expérimentales que dans celles des colonnes de sol. L'essai biologique s'est avéré être une technique plus sensible que la technique chimique et a permis de détecter une concentration diluée de métolachlore dans les couches plus profondes. Le différent comportement de lixiviation du métolachlore sous forme du composé d'addition montmorillonite-BTMA relève de la capacité d'adsorption de ce composé d'addition.

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Adsorption, Desorption, and Degradation of Three Pesticides in Different Soils

Cited by 16 publications

References 0 publications

Nematicidal efficacy, enhanced degradation and cross adaptation of carbosulfan, cadusafos and triazophos under tropical conditions

Nematicidal efficacy, enhanced degradation and cross adaptation of carbosulfan, cadusafos and triazophos under tropical conditions

Kinetics and thermodynamics of adsorption of cadusafos on soils

Leaching behavior of metolachlor in soil

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