Аннотация:Two approaches to the construction of the water retention curve on the basis of pedotransfer functions
are considered in this article. Modern pedotransfer functions are based mainly on statistical connections between basic soil parameters and functional hydrophysical parameters. A. D. Voronin theoretically predicted the presence of physically based relationships between moisture pressure and humidity, which implies the development of physically based mathematical description of the relationship of physical and hydrological properties of soils.