8 roles of soil organic matters

The following are importance or Roles of soil organic matter:

  • Organic Matter creates a granular condition of soil which maintains favorable condition of aeration and permeability. 
  • Water holding capacity of soil is increased and surface runoff, erosion etc., are reduced as there is good infiltration due to the addition of organic matter.
  • Surface mulching with coarse organic matter lowers wind erosion and lowers soil temperatures in the summer and keeps the soil warmer in winter.  
  • organic matter serves as a source of energy for the microbes and as a reservoir of nutrients that are essential for plant growth and also hormones, antibiotics.  
  • Fresh organic matter supplies food for earthworms, ants and rodents and makes soil P readily available in acid soils.  

  • Organic acids released from decomposing organic matter help to reduce alkalinity in soils; organic acids along with released CO2 dissolve minerals and make them more available.  
  • Humus (a highly decomposed organic matter) provides a storehouse for the exchangeable and available cations.  
  • It acts as a buffering agent which checks rapid chemical changes in pH and soil reaction.

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