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Physical_Classification_of_Soil_water
1. Hygroscopic water.
2. Capillary water.
3. Gravitational water.
✅Hygroscopic_water
▪️ It held mostly by soil colloids.
▪️ Such water is held at hygroscopic coefficient.
▪️Tension varies from 31-10,000 Atm
▪️Mostly non liquid therefore biologically inactive.
▪️Moves mostly in vapour form.
✅Capillary_water
▪️Such water is present in capillaries of soil.
▪️ Mostly available form of water to crops.
▪️ Capillary water functions as soil solution.
▪️Concept of capillary potential is given by Buckinghum (1907).
▪️Capillary water held between field capacity (1/3 Atm ) and wilting Coefficient is (15atm) is called available water I.e. capillary water.
✅Gravitational_water
▪️ It held by a negative tension of less than 0.3 ATM
▪️Free water which drains out also called drainage water.
▪️Usually present in macro pores.
▪️Undesirable and nutrient leaching takes place.
▪️ Downward movement of water due to gravitational force.
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