Abstract. Identification of potash deposits and production of potash fertilizers in the territory of Dehqonabad district of Kashkadarya region solved the problem of buying this mineral fertilizer from abroad for foreign currency. However, the non-uniform distribution of potassium chloride in the raw materials, the large amount of insoluble part in the composition of low-grade sylvinite negatively affects the quality of the product. Therefore, how to get quality products from raw materials that can meet world and state requirements is one of the urgent issues today. In the article, the chemical composition of the low-grade sylvinites of the Tubegatan mine, the change in their strength depending on the change in the fractional composition of the particles was studied, and it was determined that the strength of the samples increases as the size of the particles increases and the amount of potassium chloride in the samples decreases.