Tkachenko M. Reproduction of gray forest soil fertility under different fertilization systems and chemical amelioration in the Right-Bank Forest-Steppe

In dissertational work theoretically grounded and established, based on generalized experimental data of field and analytical studies, optimal for the Right-Bank Forest-Steppe chemical amelioration frequency, dose and forms of limestone ameliorants, fertilizer system in the rotation, that preserve gray forest soil fertility and guarantee the stability of crop production. Been analyzed the effects of complex anthropogenic impact on the basic properties and conditions of acid gray forest soils fertility, identified special features of the elementary soil processes and the time transformation of the basic properties under the influence of chemical reclamation and different fertilizer system in the rotation. Found the general capability of gray forest soils, which are involved in the system of intensive agriculture, for acidification by the use of fertilizers and without them. Basic laws of quantitative and qualitative changes of the humus status of gray forest soil been improved. Showed the role of interaction products, agro-meteorological, organic and mineral components in its formation. Established that long use of moderate doses of mineral and organic fertilizers on the background of liming improves humus condition, affecting not only the general content, but also the quality of it. Economic efficiency calculations of chemical reclamation for gray forest soils indicate that liming is the most effective measure to increase fertility.