Object: adaptive properties of initial material of different eco-geographical origin and constant breeding forms for productivity, elements of yield structure and quantitative indexes of grain depending on genotype and conditions of environment. Aim: it was consisted in separation of sources of valuable traits among initial material of different eco-geographical origin, determination of variety-standards, sources of economics traits, formation on their basis of work collection, creating of oat varieties and promising breeding genotypes and disclosing their adaptive peculiarities at conditions of western part of Forest-Steppe. Methods: field, laboratory, agrochemical, biometric, breeding, statistical. Novelty: for conditions of western part of Forest-Steppe it was established the peculiarities manifestation of complex traits of oat samples of different eco-geographical origin, separated the variety-standards and sources valuable traits for was formation of work collection. It was established adaptivity and stability of collection and promising breeding oat genotypes to conditions of environment. For indexes of productivity of high-plasticitive are characterized with regression coefficients from 1,11 to 8,31, and high-stabilitive with stability variances from 0 to 0,76. It was defined dependence of resistance of oat samples to vulnerability of casual agent of crown rust from eco-geographical origin. The hignest per cent of resistant varieties are discovered in North American eco-geographical group. Results: were separated sources of valuable farm traits, that combined the high indices of yield, quantity of productive stems quantity grains in panicle, length of panicle, mass of 1000 grains, contents of protein, fat law hull contents, resistance to lodging and vulnerability by basic diseases. Application stage: For period 2004-2010 on basic of conducted investigation in NCPGRP of Ukraine were registered 2 varieties (Ant and Arkan register certificates № 339, 340) and 11 lines (register certificates № 341, 405, 406, 407, 408, 409, 479, 668, 669, 670, 671) oat with complex of valuable traits or its effective connection work collection of oat for yield and its elements (register certificates of collection of plant gene pool in Ukraine № 46). On basic of high productive breeding material with complex of valuable traits it has been developed in coauthorship three new oats varieties: Arkan - entered in State Register of Plant Varieties of Ukraine in 2007 (certificate of Authorship № 0755), Khosen - entered to Register of Patents in 2012, variety of hulles oat Avhol - on State of Variety Test. Application area: breeding organizations, farms of different forms of property.
