Development of combined aggregate for improvement of meliorative condition of saline gypsum soils

Tashkent Institute of Irrigation and Agriculture Mechanization Engineers» National research university, Tashkent, Republic of Uzbekistan

^* Corresponding author: khajiev48@mail.ru

Abstract

Rapid growth of population of the republic, reduction of sown areas for various reasons and removal from agricultural works make necessary improvement of melioration of low-productive saline gypsum lands and require introduction into practice. Areas of saline gypsum lands in Uzbekistan make 320-480 thousand hectares. Among these lands special place is occupied by soils containing gypsum SaSO₄ and 2H₂O. Such soils are found practically in all regions of our republic, and improvement of their amelioration requires a separate complex and is considered one of the tasks of state importance. Before sowing in spring on saline gypsum soils are washed and applied in farms, and for re-sowing on harvested wheat the soil is prepared and laid in two layers (10-12 cm and 24-25 cm deep). It is recommended to fill it with a mixture of fertilisers (dolomite or slaked lime, cattle manure, nitrogen, phosphorus and other microfertilisers). As a result of its practical use the ameliorative condition of saline gypsum lands is improved, the yield of cultivated crops increases by 20-30 per cent, the quality of products is brought up to the level of the state standard.