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 -
- Gravitational (free) water
- Hygroscopic water
- Combined water and
- 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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