Siberian Federal University

The problem of providing the country, especially the Baikal region, with chlorine-free potash fertilizers is well known, as a result of the deficit of both the fertilizers themselves and the explored reserves of traditional mineral raw materials for their production – polyhalite, kainite and langbeinite ores. The main advantage of chlorine-free fertilizers is the possibility of their use for chlorophobic plants (potatoes, tomatoes, cabbage, buckwheat, fruit and berry crops, etc.). One of the promising and non-traditional types of raw materials for the development of the agro-industrial complex of the country and the region are aluminosilicate rocks unique in potassium content (K2O 17–21 %) and huge in reserves – synnyrites of Transbaikalia.The uniqueness of these rocks is that they are extremely potassium-saturated igneous rocks with a kalsilite-potassium feldspar association.A pure potassium variety of nepheline, kalsilite K[AlSiO4], is a rare mineral and is found in ore in a fine intergrowth with potassium feldspar K[AlSi3O8].Technological solutions for obtaining three fertilizers based on synnyrite using mechanochemical and thermochemical activation are proposed.The lemon-soluble potassium contained in kalsilite is useful component in the obtained chlorine-free potassium-containing fertilizers.The contents of total and lemon-soluble potassium in mixtures of fertilizers are determined. The positive results of using these fertilizers in the cultivation of potassium-loving agricultural crops in the conditions of Buryatia are presented