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

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 SaSO 4 and 2H 2 O. 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.

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