Lykhochvor V. Agrobiological grounds of winter wheat yield formation in the conditions of the Ukrainian Western Forest-Stepp.

The dissertation is devoted to the problems of growing technology improvement to the study of agrobiological grounds of winter wheat yield formation and elaboration of resource-saving technology of winter wheat growing for providing 60-80 c/ha of high quality. The better predecessors, tillage peculiarities, varieties adaptability for resource-saving technology, optimum mineral fertilizer rates, dates and rates of nitrogen application, seeding method, feeding area of plants, the depth of seed covering, sowing dates and seed rates, dates and rates of tur application have been established. Optimal parametres and the regularity of structure element formation of winter wheat yield are revealed under the influence of agrotechnical measures namely effective germination, overwintering, general survival, plant density and that of productive stocking, stooling, coefficient, the length of ear, the number of spikelets and kernels in the ear, grain mass from ear are determined. The interrelation betweenthem and the ways of regulation of their parametres with a help of technology are established. The influence of agrotechnical measures on grain yield and quality, structure elements of yield, is investigated, the comparative characteristics of intensive and resource saving technologies, economic and energy value of separate agrotechnical measures and resource-saving technology are made.