Hrynyk S. Optimization of Tillage Method and Fertilizer System in Short Crop-Rotation in the Precarpathian of Ukraine

The dissertation theoretically generalizes and solves in a new way the scientific problem, which is to determine the influence of the method of basic cultivation and fertilization on the fertility of sod-podzolic soil and productivity of spring wheat in the Precarpathian. It was found that the use of organic and mineral fertilizers in all methods of tillage contributed to the improvement of agrophysical and agrochemical parameters of the soil and its biological activity, which affected the density of plants and their growth and development during the growing season. Under the influence of the organic and organo-mineral system of fertilizer during surface tillage, its accelerated structuring took place. It was investigated that the application of mineral and organic fertilizers obtained at the outlet of the biogas plant, provided an increase in grain yield of spring wheat of the variety Clarissa on average for 2016–2018 by 1.41–2.43 t/ha compared to the control. The highest yields were in the application of surface tillage with organic-mineral fertilizer system – 5.28 t/ha, or 85.2 % more than in the control.