Drained Soils as an Analogue of a Large-Area Lysimeter

Surface-waterlogged soils drained by ceramic and plastic drainage are an analogue of large-area lysimetric installations, the drainage runoff in which is represented by gravitational waters similar to lysimetric waters. The drainage runoff module in spring and autumn and its dependence on the humidity of the year have been determined on test plots drained by plastic and ceramic drainage. It is shown that drainage transforms the stagnant-washing water regime into the washing type. The long-term and spatial dynamics of the removal of the clay fraction of soils and iron compounds has been studied. The leaching of chemical elements with drainage runoff and its effect on the intensity of lessivage in agro-gray drained soils have been revealed.