Swelling water and

Water in soil can be classified as gravitational water, capillary water, swelling water, and hygroscopie water (see Fig. 2). The water available to plants corresponds to the suction power of a water column 30-15,000 cm (equivalent to 0.003-1.5 MPa — pF 1.5. 2), the capillary of 2-50 pm, and field water capacity, which is the water capacity (weight percent of water per dry soil) at the permanent wilting point. The water in the capillary smaller than these values is adsorbed water or bound water, and water larger than these values is gravitational water. In both cases, these are the types of water not available to the plants. 

---