Nykytiuk Y. Agroecological evaluation of the different fertilizer systems of potatoes.

The thesis is devoted to the agroecological evaluation of ecologized in various degree and traditional fertilizer use systems when growing potatoes on soddy mediumpodrolized silty sandy loam soil with characteristic of it washing type of water regime in the conditions of the Chernihiv Polissia. For doing stated task there were conducted long-term, stationary, lysimetric, model and farming experiments, the scientific-methodical publications, ecological standards and advanced experience of given problem solution in Ukraine and abroad are generalized as a result of this the new paradigm of conducting all-round agroecological evaluation on the systemic basis was proposed with the use of three groups of criteria which characterize the effect of fertilizer technologies under study on revealing dangerous degradation and functional changes in the main block-components of agrtosystems soil, water and vegetable ones. There were used as priority criteria upsetting ecological balance in the humus and biogenous element equilibrium, nutritive losses from soil, due to wash-out and denitrification, infiltration water nitrate and other toxicant pollution, the change of species composition and soil bacteria number, agrophysical, phusical and chemical and agrochemical indices of soil fertility, worsening phutosapitary state of agrocenosis deviation of the real potato yield from the standard, the use of agroclimatic potential of the autumn vegetation period (photosynthetic active radiation, precipitation the -of apparent temperatures) and biological nitrogen, nitrate accumulation in tubers and the conformity of other yield quality indices with the European Standards energy-return and economic efficiency of the fertilizer use technologies. The use of, these criteria with the attraction of corresponding standards and five-level estimation scales allowed to determine the most efficient from the agroecological and economic standpoint fertilizer application systems. To them is related a green manure system that in ecologo-energyrespect markedly exceeds all other technologies and secures getting the high-quality yield of the standard level suitable for productions of children and dietary nourishment products. It is advisable to recommend it for the introduction in the fields remote from livestock farms. For by fafm fields the most suitable is an intensive green manure-organo-mineral model of the fertilizer use which secures the highest harvests and maximally net profit although in terms of ecological criterion it is at a disadvantage in relation to the green manure system efficiency.