1Associate Professor of the Karshi Engineering Economic Institute, tech. sciences, Republic of Uzbekistan Email id: doc.zulfiya@mail.ru
2Teacher of the Shakhrisabz Branch, Tashkent Chemical-Technological Institute, Republic of Uzbekistan
3Teacher of the Shakhrisabz branch, Tashkent Chemical-Technological Institute, Republic of Uzbekistan
4Master of Karshi Engineering and Economic Institute, Republic of Uzbekistan
Sodium nitrite can be obtained in two ways: by reacting sodium sulfate with calcium nitrite or nitrate, calcium nitrite, formed after the absorption of nitrous gases with lime milk. Study of mutual solubility of the quaternary water system of nitrites, nitrates and sulfates of sodium and calcium and its constituent ternary systems at 25°C. Their isothermal solubility diagrams has been set up. Nitrite-nitrate solutions of sodium or calcium obtained by alkaline absorption are processed into sodium or potassium nitrate, respectively. These methods have not received wide, practical application due to the high cost of alkali of sodium, potassium and the lack of systematic research. For acidic soils, the control of the disease is liming, for the rest-the addition of calcium nitrate, calcium chloride, gypsum, phosphogypsum, simple superphosphate, which, however, does not completely eliminate calcium starvation.
Binary and ternary water systems, eutonic solutions of facet ternary systems, temperature control, figurative points, four-water calcium nitrate, isothermal method
