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Articles by R. Pal
Total Records ( 3 ) for R. Pal
  R. Pal , K. Chakrabarti , A. Chakraborty and A. Chowdhury
  Pencycuron dissipation in soils of waterlogged rice field was investigated at Field Rate (FR), 2FR and 10FR with and without Decomposed Cow Manure (DCM) for two consecutive years. Pencycuron dissipated at all treatment combinations following first order kinetics and the half-lives ranged between 4.9 to 5.8 days. DCM amendment has significantly accelerated the pencycuron dissipation.
  R. Pal , K. Chakrabarti , A. Chakraborty and A. Chowdhury
  Intensive use of agrochemicals mainly pesticides in natural environments have become a major concern and have stimulated scientists to develop reliable methods to assess the potential for the transformations of these anthropogenic chemicals. These informations are very much essential for modeling the fate and effects of these chemicals in the environment. This article is a review of the information available in the literature highlighting the various soil properties, which will influence the degradation of pesticides. The extent of biodegradability depends upon the chemical structure of the pesticides. Soil physico-chemical properties influence the transformation of pesticides to a great extent. Soil microbial components largely govern pesticide degradation in soil. Maintenance of soil quality constitutes considerable intervention in the research agenda. Soil microbial biomass and its activities are important attributes of soil quality. The impact of pesticides on the soil microbial biomass, ergosterol content, respiration and fluorescein diacetate hydrolyzing activity as available in the literatures is reviewed here with especial emphasis. Most of the pesticides at field application rate did not impair the soil biological parameters. At higher rates of application the suppressive effects were transitory. Studies revealed positive correlation between pesticide transformation rate, soil physico-chemical and biological properties. Ecophysiological parameters, like the ratio of basal soil respiration to microbial biomass (qCO2), are helpful to detect the stress on microorganisms due to pesticides. Most of the studies were conducted under laboratory conditions. Field studies are conspicuously lacking in the world literature. Future research need is projected.
  N. Sanyal , R. Pal and A. Chowdhury
  Imidacloprid is a newly introduced broad-spectrum insecticide and belongs to chloronicotinyl group. Only a limited information is available on the persistence, dissipation and environmental fate of this insecticide. Therefore, from the public health and environmental safety point of view a field experiment was conducted to investigate the dissipation of imidacloprid in tea soil at termiticidal application rate. Present study revealed that the dissipation of imidacloprid in tea soil followed first order reaction kinetics and the half-life values ranged between 2.01 to 2.06 days.
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