Dissipation kinetics of halosulfuron-methyl and its effect on soil enzymes

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dc.contributor.advisorPervinder Kaur
dc.contributor.authorJasleen Kaur
dc.date.accessioned2021-09-09T06:25:40Z
dc.date.available2021-09-09T06:25:40Z
dc.date.issued2021
dc.description.abstractThe present study investigate the degradation dynamics of halosulfuron-methyl in soils under laboratory conditions. Soil samples were treated with halosulfuron-methyl at application rates of 67.5, 135, 202.5 and 270 g ha-1. Soil type, application rate and temperature had a great influence on degradation rate of halosulfuron-methyl. Halosulfuron-methyl residues were extracted by ultrasonic assisted extraction (UAE) and matrix solid phase dispersion (MSPD) and quantified using HPLC-UV. The mean percentage recoveries obtained using UAE and MSPD varied from 88.33±5.44 to 99.43±4.22% and 85.70±4.98 to 97.37±3.50% with limit of detection (LOD) and limit of quantification (LOQ) as 0.0026 µg mL-1 and 0.008 µg mL-1, respectively. Dissipation of halosulfuron-methyl followed first order kinetics with half- lives varying from 9.38 to 33.77 days. Degradation increased with increase in temperature and varied from 14.39 to 33.77, 11.05 to 28.94 and 9.38 to 25.41 days at 5±2, 15±2 and 25±2°C. Halosulfuron-methyl had a transitory effect on dehydrogenase, alkaline phosphatase, acid phosphatase activity and soil microbial biomass (bacteria, fungi, actinomycetes and phosphate solubilizing bacteria population) but urease activity remains unaffected.en_US
dc.identifier.citationJasleen Kaur (2021). Dissipation kinetics of halosulfuron-methyl and its effect on soil enzymes (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810175547
dc.keywordsHalosulfuron-methyl, First order kinetics, DT50, Enzymes, Microbes.en_US
dc.language.isoEnglishen_US
dc.pages86en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemDissipation kinetics of halosulfuron-methyl and its effect on soil enzymesen_US
dc.subChemistryen_US
dc.themeDissipation kinetics of halosulfuron-methyl and its effect on soil enzymesen_US
dc.these.typeM.Scen_US
dc.titleDissipation kinetics of halosulfuron-methyl and its effect on soil enzymesen_US
dc.typeThesisen_US
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