Changes of the agrochemical soil characteristics in the stone fruit orchard with the permanent application of nitrogen and potash fertilizers

The purpose of the research was to evaluate changes in agrochemical properties sour cherry orchard soil after permanent fertilization with urea and potassium sulfate. field experiment conducted during 2017-2021 climatic conditions Central Russian Upland (Oryol region). ‘Turgenevka’ trees grafted on rootstock V-2-180 were planted 2015 at a distance 5x3 m. is loamy Haplic Luvisol following parameters: pH KCl - 5.8, organic matter content 2.8%, available phosphorus 383 mg/kg, exchange -120 alkali-hydrolysable nitrogen 108 mg/kg. Experimental scheme: 1. Control (no fertilizers); 2. N30К40; 3. N60К80; 4. N90K120; 5. N120K160. Fertilizers applied once year early spring. annual use fertilizers N90K120 dose or more contributed an increase reserves mobile phosphorus, potassium, soil, but did not have stable effect tree productivity. At same time, there acidity loss calcium under influence fertilizers, which indicates beginning degradation processes.