The purpose of the research was to study the effect of liquid fraction of pig manure on the productivity of spring wheat on meadow and chernozyom soil. The studies were conducted in FSBEI Omsk State Agrarian University in 2015-2017 on the variety of spring wheat "To the memory of Aziev". The contents of N-NO3 in the soil before sowing was 5.20-12.1, P2O5 - 113-120, K2O - 241-436 mg/kg. Spring wheat’s yield in the conditions of forest-steppe of Omsk Region for the vegetation of cre-ated crop on average for years of researches without application of fertilizers was 2.70 t/hectare, at applica-tion of fertilizers - 3.06-4.14 t/hectare. The application of 200 t/hectare was the most effective - the increase of the crop made 1.43 t, or 53.02 %. The payback of the fertilizer unit (1 t), with the maximum of 200 t/hectare was also in the variant and amounted to 7.2 kg. The introduction of liquid manure significantly increased the content of nitrate nitrogen (from very low to very high) and exchange potassium. The sum of studied amino acids in the protein of spring wheat grain varieties mixed with the maximum value (9.06 %) was observed when making 150 t/hectare. Significant increase in the doses to 250-300 t/hectare had negative impact on amino acid content - it decreased to 8.22 from 7.26 %. The studies showed that the optimal ratio of the harvest of spring wheat grain to straw was 1:1.41-1:1.47, at this ratio the maximum yield in the experiment was obtained. Suitable record for barley was 1:1.18-1:1.22. This indicator was required to calculate the balance of nutrients and provid-ing the system of fertilizers in farming and planning spe-cific quantities of yield.