The Relationship of Soil Water with Soil Moisture Constants

Investigation of soil moisture constants, physical properties of soils and their relationships will be of much use for an understanding of the moisture characteristics of the soils. The classification of soil moisture in relation to plant is a realistic approach. The range of soil water from wilting coefficient to field capacity is of greater importance due to its availability for crop growth and production. which has been designated as 'available range. The range of soil water from wilting coefficient' to 'ultimate wilting point' and that from ultimate wilting point to zero have been named as "moisture unavailable to plants" respectively. Soil moisture constants viz., water holding capacity, moisture equivalent, wilting point, ultimate wilting point, their inter-relationships and relationship with soil water are discussed in this paper.