Assessment of main fertility indicators of dark gray podzolized soil at the long-term systematic application of fertilizers

Goal. Based on observations in the system of range agroecological monitoring to identify changes in the natural cycle of nutrients and toxic elements due to anthropogenic factors. Methods. General scientific methods of materialist dialectics, scientific abstraction, analysis and synthesis, logical thinking, and special: range agroecological monitoring, mathematical and statistical. Results. The results of studies conducted on dark gray podzolized soil of the Right-Bank Forest-Steppe with long-term application of mineral fertilizers and the background of by-products of the predecessor during 1987–2017 are shown. It is fixed that humus content has increased by 0.2–0.3%, while the indices of exchange and potential acidity, as well as the amount of the absorbed bases compared to the ecotope without the use of fertilizers, have dropped. That is the indication of the acidifying action of the applied fertilizers and the need for liming. The number of compounds of light hydrolysis and mineral nitrogen in fertilized ecotopes was at very low and low levels. When applying a double dose of mineral fertilizers N75P74K83 on the background of organic levels, the content of mobile phosphates and potassium was respectively very high and high, which provided optimal conditions for phosphorus and potassium nutrition of crop rotation plants. None of the ecotopes exceeded the maximum allowable concentration (MAC) and the background content of mobile forms of lead, cadmium and nickel for the soils of Ukraine. The content of copper in the soil was low and medium, and the content of zinc was very low and low. Conclusions. During long-term anthropogenic loading for 30 years in the grain-crop rotation of the Right-Bank Forest-Steppe with the application of 232–349 kg/ha NRK on the background of plowing of by-products of plant growing there was an expanded reproduction of fertility of dark-gray podzolized soil as to humus, mobile forms of phosphorus and potassium. But a tendency was observed of accumulation of mobile forms of cadmium with a simultaneous deepening of copper and zinc deficiency.