Adsorption and degradation studies of pretilachlor in three different soils of Punjab
| dc.contributor.advisor | Pervinder Kaur | |
| dc.contributor.author | Paawan Kaur | |
| dc.date.accessioned | 2016-12-23T13:53:24Z | |
| dc.date.available | 2016-12-23T13:53:24Z | |
| dc.date.issued | 2014 | |
| dc.description.abstract | The present investigation was undertaken to study the adsorption-desorption and degradation behaviour of pretilachlor in Punjab soils. Pretilachlor [2-chloro-2', 6'-diethyl-N-(2propoxyethyl) acetanilide] is pre-emergence herbicide used for the control of sedges and broadleaf weeds in transplanted and direct seeded paddy fields. Adsorption-desorption experiments were carried out to study the effect of concentration, soil type and temperature, using batch equilibration process. Pretilachlor was quantified using HPLC. The adsorption-desorption data fitted well in Freundlich equation for three soils, irrespective of temperature. The adsorptiondesorption of pretilachlor was in order: clay loam>sandy loam> loamy sand soil indicating positive correlation of adsorption-desorption with organic matter and clay content. The values of ∆G were negative and increased with rise in temperature indicating that the adsorption-desorption of pretilachlor on soil samples was a spontaneous endothermic process becoming more favourable at higher temperature. Field trials were carried out to investigate the dissipation and residue levels of pretilachlor in soil and water of paddy fields. Soil/rice samples were extracted using matrix solid phase dispersion method and water samples were extracted using liquid-liquid extraction technique. The dissipation of pretilachlor in paddy field soil and water followed first order kinetics showing a half life of 7.52-09.58 days and 01.89- 02.97 days, respectively, at application rate of 0.75 and 1.5 kg ha-1. Residues of pretilachlor at harvest in soil and rice grain were below 0.01 µg g-1. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/92447 | |
| dc.publisher | Punjab Agricultural University, Ludhiana | en_US |
| dc.research.problem | Adsorption and degradation studies of pretilachlor in three different soils of Punjab | en_US |
| dc.sub | Chemistry | en_US |
| dc.these.type | M.Sc | |
| dc.title | Adsorption and degradation studies of pretilachlor in three different soils of Punjab | en_US |
| dc.type | Thesis | en_US |