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In a market economy, agricultural enterprises have switched to a new system for planning and justifying the arable yielding capacity. Soil cover patterns in West Siberia are very diverse. From an economic point of view this raises certain difficulties relating to the formation of crop yields. The given work is based on the results of long-term studies obtained at the Department of Soil Science and Agrochemistry of the Northern Trans-Ural State Agricultural University. The author performs the calculation of the crop yield generated on the main soils of West Siberia. To obtain 3.0 tons per hectare of spring wheat on leached chernozem, it is required to apply up to 180 kg of ammonium nitrate. On other soil patterns, it is necessary to provide for the use of nitrogen-phosphorus fertilizers. To ensure generation of 4.0 t/ha of spring wheat on sod-podzolic and gray forest soils, 340-350 kg of ammonium nitrate and 340-400 kg of ammophos per hectare are required. The probability of obtaining 4.0 t/ha and 5.0 t/ha is 76 and 47%, respectively. With the increase in the planned yield, the role of mineral fertilizers increases substantially and, at the existing prices for fertilizers and grain, makes cultivation unprofitable. The economic threshold for cereal crops grown on chernozems in West Siberia is estimated to be 4.0 t/ha while on gray forest soils it is no more than 2.5 t/ha. Light gray and podzolic soils are characterized by very low nutrient potential. To obtain 2.0 and more t/ha of grain it is mandatory to apply mineral fertilizers to such soils. This leads to a substantial increase in the cost of money and a decrease in the profitability of growing cereal crops at existing grain prices. Keywords— Mineral fertilizers, soil fertility, crop yield, West Siberian soils, profit, profitability.

Agroeconomic Rationale for Applying Mineral Fertilizers to Cereal Crops in West Siberia