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20151
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Subject: Chemistry × Author: Dimple Rani × End date: 2015 × Start date: 2015 × Type: Thesis ×
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    ThesisItemOpen Access
    Persistence and Leaching Behaviour of Premix Formulation of Imazethapyr and Imazamox in Soil
    (CCSHAU, 2015) Dimple Rani; Duhan, Anil
    A laboratory experiment was conducted in Agrochemicals Residues Testing Laboratory, Department of Agronomy, Chaudhary Charan Singh Haryana Agricultural University to study the persistence behavior and leaching potential of imazethapyr and imazamox residues in loamy sand and clay loam soil. Imazethapyr and imazamox (Odyssey 70 WG) herbicides at single and double dose, i.e., 70 and 140 g a.i./ha, was applied in soil taken in plastic pots. Soil samples were collected periodically on 0 (1h), 1, 3, 7, 10, 15, 30, 45, 60 and 90 days after treatments. In leaching experiment, imazethapyr and imazamox were applied as 50 (single dose) and 100 (double dose) μg in both soils packed in plexi glass columns. Residues were estimated by GC-MS-tandem mass spectrometry equipped with capillary column. Per cent recoveries at fortification level 0.003 and 0.006 μg/g in both soils were more than 80 per cent depicting validity of methods used for present studies. Limit of detection and quantification were 0.001 and 0.003 μg/g, respectively for both soils. Dissipation followed a first order kinetics with a half-life of 28.97 and 39.84 days for imazethapyr and 19.56 and 29.54 days for imazamox in loamy sand soil and in case of clay loam, 34.97 and 43.26 days for imazethapyr and 23.52 and 34.31 days for imazamox at both the doses, respectively. Up to 90th DAT, complete degradation of residues was not observed in any of the treatment. Leaching experiment was carried out in laboratory under both continuous and discontinuous flow conditions. The residues of imazethapyr were retained up to soil depth of 15-20 and 20-25 cm and of imazamox up to soil depth of 15-20 cm in loamy sand soil and in case of clay loam, retention of imazethapyr residues were up to soil depth of 10-15 and for imazamox up to soil depth of 10-15 and 15-20 cm under continuous flow conditions at both doses, respectively. Under discontinuous flow, movement of residues was quite slow and most of residues were retained up to soil depth of 10-15 and 15-20 cm in both types of soil under both doses, respectively. The residues of imazethapyr and imazamox were not detected in any of the leachate fractions of soil and doses, hence considered safe for ground water.