The effectiveness of using the solid fraction of pork liquid manure for barley on the quasi-gley agro-chernozem of Western Siberia

The aim of the research was to study the effect of organic fertilizer based on the solid fraction of liquid pig manure on the yield and quality of spring barley and on the fertility of quasi-gley agro-chernozem in the southern forest-steppe of Western Siberia. The research was conducted at the Omsk State Agrarian University in 2015-2017. The barley variety “Podarok Sibiri” was cultivated. The content of different substances in the soil before sowing amounted to: N-NО3 - 2.44-4.85; P2O5 - 98-112; K2O - 222-338 mg/kg. The use of the solid fraction of pig manures at a doses of 50 t/ha was highly effective: the yield increase amounted to 0.82 t/ha or 38.6% if compared to the control sample. The use of 1 ton of manure increased the content of nitrate nitrogen while cultivating barley by 0.62 mg/kg in the 0-20 cm soil layer, that of mobile phosphorus and potassium by 1.01 and 0.65 mg/kg, respectively. When applying all doses of manure, an increase in the amount of crude protein in the grain was observed: the control sample contained 13.52%, while in the option with fertilizers it amounted to 14.01-14.50%. The use of 20-60 t/ha of manure increased the thousand kernel weight from 41.4 g (control sample) to 42.4-44.6 g; when applying 30-60 t/ha, the number of grains per spike amounted from 18 to 19-22. The research determined the agrochemical parameters of the mineral nutrition of barley on quasi-gley agro-chernozem when using organic fertilizers based on the solid fraction of liquid pig manure to calculate the doses of fertilizers and the balance of nutrition elements in the crop rotation.