Application of organic fertilizers based on the solid fraction of liquid pig manure in the cultivation of spring wheat

The aim of the research is to study the effect of organic fertilizers base on the solid fraction of liquid pig manure on the productivity of spring wheat on meadow-chernozem soil. The research was carried out at the Omsk State Agrarian University in 2015-2017. It regarded the variety “Duet”. Before sowing the soil contained the following elements: N-NO3 - 2.26-4.48 mg/kg, P2O5 - 99-108 mg/kg, K2O - 311-345 mg/kg. The best effect was obtained with a dose of 50 t/ha, with an increase in the yield of 0.70 t or 38.46% if compared to the control sample, the total aftereffect over 3 years after treatment at a dose of 60 t/ha amounted to 1.60 t/ha (26.67%). The effect of 1 ton of pig manure increased the content of nitrate nitrogen in the soil by 0.58 mg/kg, of mobile P2O5 by 1.08 mg/kg, of K2O by 0.86 mg/kg. The positive effect of the solid fraction on the grain quality has been established. The concentration of gluten increased under the action of manure and amounted to 35.1-35.7% (34.5% in the control sample). The vitreousness of kernels varied from 62% in the control sample to 67-71%. An increase in the protein content was also observed when using all doses of the fertilizer (19.0-20.5%, against 18.5% in the control sample). The thousand kernel weight increased from 35.16 g in the control sample to 36.8-40.01 g with a dose of 40-60 t/ha.