The objectives of the present study were to compare oat genetic material according to its phenological traits under organic and conventional conditions. The field trials in two management systems (plot size 10 m 2, 3 replicates) were carried out in 2010 and 2011 at State Stende Cereal Breeding Institute. Twenty-one oat genotypes from the breeding program were chosen for this experiment. The phenological traits: field germination (growing stage/GS10), tillering (GS21), stem elongation (GS30), flag leaf emergence (GS 42-43), panicle stage (GS50-52) and maturity (GS92) were determined. The significant genotypic variation noted for most of the evaluated traits indicated the possibility of selection for these traits in oat. As the t-test indicated, the oat genotypes grown in organic conditions had significantly (p
