Two years trial was carried out on the property of Small Grains Research Centre in Kragujevac. Six winter and six spring oat genotypes were investigated. The next traits: plants height, panicle lenght, ear number in panicle, grain number in panicle and grain weight in panicle were studied. Those morphologic traits influence the yield of grains. The standard cultivars were Vranac for winter and Slavuj for spring oat genotypes. The winter genotypes had more plants height, more panicle lenght and

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... ore ears in panicle,but spring genotypes had more grains in panicle. The grains weight per panicle was the almost same for both. The correlations beetwen the plants height and the panicle lenght were possitive and statistically significant. These traits were influenced by climatic and genetic factors while the winter genotypes were more susceptible to enviromental conditions then the spring genotypes.