Potato nutrition management based on the use of liquid bird manure in the forest-steppe of Western Siberia

The research allowed for the development of agrochemical regulatory parameters for the use of organic fertilizer based on liquid bird manure for potato nutrition management on the meadow-chernozem soil of the forest-steppe of Western Siberia. The experiments were conducted at the Experimental Field of the Department of Agrochemistry and Soil Science of the Omsk State Agrarian University in 2012-2014. Object of the study were potato plants of the variety “Alaya Zarya”, cultivated on meadow-chernozem soil with average fertility, average humus content, average loam content. Before plant the content of N-NO3 in the soil amounted to 6.1-10.4 mg/kg, that of P2O5 to 111-124 mg/kg, that of K2O to 256-274 mg/kg. Potatoes formed a yield without fertilizers of 22.9 t/ha, in case of treatment with fertilizers of 26.0-33.2 t/ha. The most effective in terms of increasing productivity was the application of 12 t/ha, with an increase in yield of 10.3 t or 45.0%, the payback of 1 ton of manure amounted to 0.86 t of tubers. 1 t of liquid manure increases the concentration of N-NO3 in the soil by 2.06 mg/kg, of P2O5 by 2.73 mg/kg and of K2O by 1.28 mg/kg. The quantitative characteristics of the intensity of action of 1 t of manure on potato yield (1.14 t/ha) have been established and based on this, a formula is proposed for calculating doses for planned crop increase. The standard rate of the intensity of 1 t/ha of manure on the content of nitrate nitrogen, mobile phosphorus and potassium has been identified, which allows to make a prediction of their accumulation in the soil and determine the amount of fertilizers taking into account the optimal and the actual content of a precise nutrient in the soil.