ON THE CLASSIFICATION OF THE WATER REGIME OF IRRIGATED SOILS

The basic principles of genetic classification of water regimes are va lid for irrigated soils, if irrigation rates are taken into account. I t is proposed that the amount of ground waters involved in the water s upply to the soil profile be considered at the subtype level. Families of water regimes are separated by the degree of soil profile moisteni ng, which is expressed in traditional categories of soil water. The wa ter supply of soils is assessed according to the reserves of available water in the 0- to 20-cm (arable) and 0- to 100-cm layers.