Bioenergetic efficiency of the use of fertilizers in the cultivation of potatoes

The research has established the energy efficiency of an organic fertilizer based on liquid chicken manure for potatoes on the meadow-chernozem soil of the forest-steppe of Western Siberia. The experiments were conducted at the experimental field and the Department of Agrochemistry and Soil Science of the Omsk State Agrarian University in 2012-2014. The studied objects were potato plants of the “Alaya Zarya” variety, meadow-chernozem soil with average fertility, average humus and loam content, mineral fertilizers, organic fertilizers based on rotted liquid chicken manure. The content of N-NO3 in the soil before planting amounted to 6.1-10.4 mg/kg, P2O5 to 111-124 mg/kg, K2O to 256-274 mg/kg. The highest yield of potato tubers was obtained when applying rotted organic fertilizer at a dose of 12 t/ha and amounted to 33.2 t/ha, which is 10.3 t/ha (45%) higher than in the control sample. The use of mineral fertilizers in the amount of N328P276K96, equal to the content of nutrients in 16 tons of organic fertilizer, also did not lead to an increase in the yield of potato tubers (amounting to 32.3 t/ha with an increase of 9.4 t/ha (41.0%)) if compared to a dose of 12 t/ha. The highest energy efficiency from the use of fertilizers in the cultivation of potatoes was obtained: when applying organic fertilizers based on liquid chicken manure at doses of 8 and 12 t/ha (bioenergetic efficiency of 7.97 and 7.50, respectively); when applying mineral fertilizers at a dose of N164P138K48 (efficiency of 1.88); with the complex application of mineral and organic fertilizers based on liquid chicken manure at a dose of 4 t/ha + N82P69K24 (efficiency of 3.33).