Question

Differentiate between Hygroscopic water and capillary water.

Answer 1

Hint: Type of water held by the soil- unavailable to plant and available to plants. In capillary water the water is maximum because of evaporation than the hydroscopic.

Complete answer:

Hygroscopic Water	Capillary water
-Present in thin-film tightly held by the soil.	-Present in the form of the film around the soil.
-Water held by the soil particle.	-Water holds between the soil particles.
-Unavailable to plants.	-Available for atmospheric absorption.
-Water absorbed from the atmosphere.	-Water remains the soil.

Additional Information:
-Classification of soil water: gravitational water, field water, capillary water and hygroscopic water.
-The difference between the free energy of soil water and that of pure water in a standard reference is called soil water potential.
-The movement of water under saturated soil condition and it is mainly determined by two forces: hydraulic force and hydraulic conductivity are termed as saturated water flow.
-The movement of water in the soil through capillary pores and it mainly depends upon two factors: hydraulic conductivity and driving force.
-The water vapours move from moist soil to a dry soil where the vapour is somewhat lower is termed as vapour movement.

Note: -The plant access to water either by the capillary movement of soil water to plant roots and growth of plant roots into moist soil.
-The transport of soil solution containing nutrients to plant roots caused by water potential gradient developed due to loss of water through transpiration or evaporation is termed as mass flow.