Dombrovska S. The optimization of ecological state of hayfields and pasture fields of the northern Steppe of Ukraine

The thesis is devoted to the development of science-based ways to optimize the current ecological condition of natural and anthropogenic secondary hayfields and pasture fields of the northern Steppe of Ukraine, the assessment of their resource potential, the definition of the environmental characteristics of the formation of kinds forage of phytocoenosis, biological and ecological common factors of development of meadow and steppe herbage and development of theoretical framework practical methods of conservation and restoration of the natural potential of plant resources on these agricultural lands due to the use of modern technologies, phytocenotic and environmental factors, in particular the systems of usage, tending, fertilizer. All forage grasslands on the basis of the soil-environmental, ecological and botanical and economic principles divided into 4 classes, 9 types and 11 varieties, there is presented their complete environmental performance. A complex inventory of the modern species composition has been made, so it was identified 720 species of fodder plants, and their abstract is composed, analysis is made. For the conditions of northern Steppe of Ukraine the high economic and bioenergy efficiency techniques improve forage land surface in the production of green pasture forages fixed, which is provided on the floodplain and lowland meadows, where the attributable and net profit from pasture topping after uneaten plants by animals is 81-120 UAH/hectare, and fertilizing of hayfields and pastures with fertilizers in dose N30 provides the profit from 123 to 450 UAH/hectare.