The depth of water required to bring the soil moisture content of a given soil upto its field capacity is called:

Explanation:

Readily available moisture-

•  It is that portion of the available moisture that is most easily extracted by the plants and is approximately 75 to 80% of the available moisture.

Field Capacity-

• Immediately after a rain or irrigation water application, when all the gravity water has drained down to the water table, a certain amount of water is retained on the surfaces of soil grains by molecular attraction and by loose chemical bonds. This water cannot be easily drained under gravity and this is called field capacity.

Permanent wilting point-

• It is the water content at which the plant can no longer extract sufficient water for its growth, and wilts up.

Soil moisture deficiency-

• The water required to bring the soil moisture content of a given soil to its field capacity is called field moisture deficiency or soil moisture deficiency.