Dissipation kinetics of halosulfuron-methyl and its effect on soil enzymes
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
The 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.
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Citation
Jasleen Kaur (2021). Dissipation kinetics of halosulfuron-methyl and its effect on soil enzymes (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.