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Related Experiment Videos

Insecticides: their effect on microorganisms and persistence in rice soil

A C Das1, A Chakravarty, P Sukul

  • 1Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, India.

Microbiological Research
|May 1, 1995
PubMed
Summary

This study shows that insecticides like HCH and fenvalerate significantly boost soil microbes, while others have varied effects. Insecticide persistence in rice soil also differs, with HCH lasting longest.

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Area of Science:

  • Environmental Science
  • Soil Microbiology
  • Agricultural Chemistry

Background:

  • Insecticides are crucial for crop protection but can impact soil microbial communities.
  • Understanding these effects is vital for sustainable agriculture and soil health.
  • Rice cultivation utilizes various chemical insecticides, necessitating research into their ecological footprint.

Purpose of the Study:

  • To evaluate the impact of four insecticides (HCH, phorate, carbofuran, fenvalerate) on soil microorganisms in rice fields.
  • To assess the persistence of these insecticides within the rice rhizosphere.
  • To identify specific microbial groups affected by different insecticidal treatments.

Main Methods:

  • Field experiment with four insecticides (HCH, phorate, carbofuran, fenvalerate) at recommended doses.

Related Experiment Videos

  • Quantification of bacteria, actinomycetes, and fungi populations in rhizosphere soil.
  • Analysis of insecticide dissipation rates in soil.

    • Main Results:

    • HCH and fenvalerate significantly stimulated overall microbial proliferation.
    • Phorate increased bacteria and actinomycetes; carbofuran favored actinomycetes.
    • Differential effects observed on specific genera; HCH showed highest persistence, fenvalerate the lowest.

    Conclusions:

    • Insecticides exert varied influences on soil microbial communities, with some promoting growth and others inhibiting specific bacteria.
    • Microbial responses are genus-specific, highlighting the complexity of insecticide-microbe interactions.
    • Insecticide persistence in soil varies significantly, impacting long-term ecological effects in rice agroecosystems.