Agronomic efficiency of fertilizers on potatoes

The article presents data of four-year studies on the effect of fertilizers and preparation “Nurse mycorrhiza” on yield and yield increase of tubers and by-products of potato variety Red Scarlet, nitrogen, phosphorus and potassium removal, balance of nutrients, payback of fertilizers by tuber yield increase. The paper reflects the refined data on payment for fertilizers by tuber yield increment and nutrient elements removal by potato tubers taking into account Red Scarlet variety haulm under conditions of 2021-2024. The calculated fertilization systems provided 19-22 t/ha of potato tubers, and inoculation of tubers with the preparation increased the yield by 0.4-0.7 t/ha under mineral fertilization systems and by 1.5 t/ha - under organo-mineral fertilization system. The calculated fertilizer systems provided actual balance coefficients for nitrogen 66-93%, for phosphorus 84-106%, for potassium 181-214%, i.e. they differed in nitrogen by 7-21%, in phosphorus - by 6-16%, in potassium - by 14-19%. The biopreparation increased crop nitrogen utilization by 4-11 kg/ha, phosphorus - by 1-4 kg/ha and potassium - by 6-19 kg/ha, i.e. on its background actual N, phosphorus and potassium Kb increased by 4-7%, 2-8% and 6-19%, respectively. The calculated fertilizer systems provided a high payment of 27-30.5 kg of tubers per 1 kg of application rate of fertilizer applied.