06 Plant Water Relation - part 03 - Water available to roots for absorption

06 Plant Water Relation - part 03 - Water available to roots for absorption


Water available to roots for absorption: 
  • Plants absorb water from the rhizosphere (the microenvironment surrounding the root). 
  • Water present in the soil occurs as -  
  1. Gravitational (free) water
  2. Hygroscopic water
  3. Combined water and 
  4. Capillary water. 
  • Water percolates deep, due to the gravity, in the soil, is called `gravitational water'. This is not available to plants for absorption. 
  • Fine soil particles imbibe/ adsorb water and hold it. This is called `hygroscopic water'. Roots cannot absorb it. 
  • Water present in the form of hydrated oxides of silicon, aluminum, etc., is called `combined water'. It is also not available to plants for absorption. 
  • Some amount of water is held in pores present between the neighbouring soil particles, due to capillarity. This is called capillary water that is avilable for absorption.


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