CLASSIFICATION OF SOIL MOISTURE OR WATER
soil water is water available for consumption by plants . Soil water has been classified from a physical and biological point of view as Physical classification of soil water, and biological classification of soil water. Physical classification of soil water Gravitational water Gravitational water occupies the larger soil pores (macro pores) and moves down readily under the force of gravity. Water in excess of the field capacity is termed gravitational water. Gravitational water is of no use to plants because it occupies the larger pores. It reduces aeration in the soil. Thus, its removal from soil is a requisite for optimum plant growth. Soil moisture tension at gravitational state is zero or less than 1/3 atmosphere. Factors affecting gravitational water Texture: Plays a great role in controlling the rate of movement of gravitational water. The flow of water is proportional to the size of particles. The bigger the particle, the more rapid is the flow or movement. B...