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8. What is allelopathy? Discuss its role in major cropping systems of irrigated agriculture.




       Allelopathy refers to a biochemical phenomena where one organism influences the germination, growth, survival and reproduction of another organism using biochemicals.

    The impact can be beneficial (positive allelopathy) or detrimental (negative alleolopathy). It is a branch of chemical ecology. Chemical interference is used as a tool of competition.

     It is observed and studied in plant-plant, plant-microbes and plant–animal interactions.
Role in major cropping systems of irrigated agriculture:
  Allelochemicals are found in flowers, stem, leaves, flowers can be used to aid beneficially in agriculture. Such as,

  • Sustainable weed management: Phytotoxins and allelopathic tendencies of crops can be used to reduce and inhibit the growth of weeds.
  • Straw mulching: Chemicals released by it reduce the incidence of weeds and pests. It can improve soil fertility and moisture retention by increasing organic content.
  • Intercropping and crop Rotation: Knowledge about the alleopathic relations between plants can be used effectively in intercropping to improve yield. It has been observed that intercropping of sorghum, sesame produced better output than cotton alone.
  • Effective application of allelopathy can decrease usage of insecticide, pesticide, and herbicide. 
  • Bio pesticides obtained from allelopathic chemicals can be also used for environment friendly agriculture.

     Allelopathy is a novel application to improve crop yield to meet the demands of an ever increasing population. However, inadequate research data has resulted in ineffective implementation. It can provide agricultural sustainability, environmental protection, food security, resource conservation and economic viability. 

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