The Dynamics of sodium in profile of reclaimed solonetzes in Baraba
It was studied the dynamics of sodium (common, exchangeable and water-soluble) in long-term experiments in soils reclaimed by gypsum one time. It was found that the involvement of solonetzic soils in agricultural use even without applying ameliorants the content of exchangeable sodium decreasing. In application the full calculated dose gypsum almost all the sodium being replaced by calcium, when the groundwater provided at a depth of 250 cm and more. With the rise of the groundwater level in the profile of solonetzes the content of total sodium increases drastically, which is caused by secondary salinization. Full and higher dose of gypsum contributed to the preservation of ameliorative effect at the time secondary salinization. Subsequent decrease the groundwater level caused a sharp decline in the total sodium content in all variants.