Kozak M. Agroecological princeiples of the soil fertility preservation in industrial apple-tree plantations and their avaluation for Ukrainian horticultire-Amanuscript

Object of researches - apple-tree plantation on the different types of soil in Ukrainian Steppe and Forest-steppe. Purpore of researches - scientific basis for production of the high fruit harvests under conditions of the preservation of soil fertility and development of ecologically safe environment through optimisation of fertilizen application system and garden interline space keeping system. Methods and instrumentation - expeditionary studies of soil under apple-tree plantation in Crimea Steppe and long-term field experiments in Ukrainian Forest-steppe. Theoretical and practical outcome - the theoretical basis of the researches is beogeocenotic approach to the estimation of the expirimental data. Practical outcome - development of methodical approaches and soil bonity scale, degradation threshold for the dark-gray podzolic soil, fertilizer application system and garden interline space keeping system, soil fertility models for the same soils and biogiocenotic scheme for carrying out of gardening. No velty - newly embedded: bonity scale for soils under apple-tree, unconvertible threshold for dark-gray podzolic soils degradation and ecological index for the control of such soil state, biogeocenotic scheme for the researches in the field of gardening. Embedding degree: methodical recommendations for soils bonity determination.