Sorption and movement of cyantraniliprole in sandy loam soils with and without organic amendments (Record no. 289327)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04966nam a22001817a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 631.4 |
| Item number | ALN/SO PG |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Al Noufiya, S |
| 245 ## - TITLE STATEMENT | |
| Title | Sorption and movement of cyantraniliprole in sandy loam soils with and without organic amendments |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellayani |
| Name of publisher, distributor, etc | Department od Soil Science and Agricultural Chemistry |
| Date of publication, distribution, etc | 2021 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 102p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | M Sc |
| 520 ## - SUMMARY, ETC. | |
| Abstract | The study entitled “Sorption and movement of cyantraniliprole in sandy loam soils with and without organic amendments” was conducted in the Department of Soil Science and Agricultural Chemistry and the laboratory attached to the All India Network Project (AINP) on Pesticide Residues, College of Agriculture, Vellayani, Thiruvananthapuram, Kerala during 2019-21. The main objectives of the experiment were to study the adsorption, desorption, persistence and leaching of cyantraniliprole in sandy loam soils with and without addition of organic amendment at the rate of 0.5 per cent Farm Yard Manure (FYM). The soil was collected from the sandy belts of Kazhakkoottam, Thiruvananthapuram. The physical and chemical analysis of the soil revealed that the soil was moderately acidic, with 0.84 per cent organic matter, 11.80 per cent clay, 22.30 per cent silt and 65.90 per cent sand. Among the major nutrients, phosphorus content was found to be high; potassium was medium while the other nutrients were low. The method for estimation of cyantraniliprole residues in soil were validated by modified QuEChERS method and was found ideal. Liquid- liquid partitioning using dichloromethane was found suitable for cyantraniliprole residue estimation in water. The adsorption-desorption studies were carried out at 5 different concentrations of 20, 40, 60, 80 and 100 μg levels each both in normal soil and 0.5 per cent FYM amended soil in Completely Randomized Design (CRD) with ten treatments and three replications and was repeated by direct spiking also. The adsorption- desorption data fitted well in Freundlich adsorption isotherm. The distribution coefficient, K d (mean value) was found high in amended soil (2.55) than normal soil (2.40) which indicated increased sorption in relation to organic matter content. The K f values (adsorption coefficient) were 2.60 and 2.45 for amended and normal soil respectively, indicating a high sorption capacity for the amended soil. The desorption was carried out in three cycles, the percentage desorption was decreasing in each consecutive cycle. In all levels of concentration, desorption was slower than adsorption indicating a hysteresis effect. In the soil samples directly spikedwith cyantraniliprole also, the desorption percentages were found lower and formed a still higher hysteresis. Mobility of cyantraniliprole was assessed in CRD with eighteen treatments and three replications i.e., by loading 3 levels viz., 25, 50 and 75 μg concentrations of cyantraniliprole, separately on top of 200 g soil columns loaded in PVC pipes and followed by eluting with 40, 80 and 160 mL of water @ 0.4 ml min -1 . In all the treatments residues were obtained in 0-25 cm packed columns and also in the leachate. In the normal soil, cyantraniliprole moved down the soil column which resulted in residue levels ranging from 7.48-3.98, 19.27- 9.57 and 27.67- 13.41 μg at 25, 50 and 75 μg levels, respectively when eluted with different volumes of water. In the soil amended with 0.5 per cent FYM, the corresponding residues ranged from 10.41- 4.48, 21.08- 9.89 and 29.98- 14.19 μg at 25, 50 and 75 μg levels indicating a higher retention in soil. The persistence of cyantraniliprole in normal soil and amended soil under three soil moisture conditions (air dry, field capacity and saturated) were studied using the formulation of cyantraniliprole added at the rate of 1, 2 and 4 mg kg -1 in CRD with eighteen treatments and three replications. The half- life of cyantraniliprole was found highest in amended soil spiked with 4 mg kg -1 cyantraniliprole under air dry soil condition i.e., 32.44 days followed by the same under normal soil condition i.e., 30.45 days. In the persistence study, no metabolites of cyantraniliprole were detected. The study concluded that the adsorption coefficient was higher in FYM amended soil indicating stronger adsorption than normal soil and the desorption percentages were reduced in the same. Hysteresis effect was noticed in all the treatments indicating slower desorption than adsorption. The mobility of cyantraniliprole was found to be slightly higher in normal soil compared to the 0.5 per cent FYM amended soil and also indicates its moderate mobility behaviour. The dissipation was found to be the fastest under submerged condition followed by field capacity and air dry conditions. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Soil Science |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Agricultural Chemistry |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | cyantraniliprole |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Thomas George |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Item type | Theses |
| Not for loan | Collection code | Permanent location | Current location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Reference Book | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2022-04-21 | 631.4 ALN/SO PG | 175266 | 2022-04-21 | Theses |