Explanation:

Water in the soil available to plants is referred to as capillary water. This water is held in the soil pores by capillary forces and is accessible to plant roots for absorption.

Types of Soil Water:
There are three types of soil water, namely:
1. Gravitational Water
2. Capillary Water
3. Hygroscopic Water

Gravitational Water:
Gravitational water is the water that drains rapidly through the soil due to the force of gravity. It is not available to plants as it moves down beyond the root zone. This water is usually lost as runoff or percolates deeper into the ground.

Capillary Water:
Capillary water is the water that is held in the soil pores against the force of gravity. It is available to plants as it is held in the root zone. Capillary water is crucial for plant growth as it provides the necessary moisture and nutrients for absorption by the roots. This water moves upward through the soil by capillary action, ensuring that the root zone remains adequately moist.

Hygroscopic Water:
Hygroscopic water is the water that is tightly bound to the soil particles and is unavailable to plants. This water is held so tightly that it cannot be removed by plant roots. It is considered as soil moisture at hygroscopic equilibrium and is not accessible for plant uptake.

Conclusion:
Water in the soil available to plants is capillary water, as it is held against the force of gravity in the root zone and is accessible for absorption by plant roots. Gravitational water drains rapidly, while hygroscopic water is tightly bound to the soil particles and not available for plant uptake.