engleski

Agronomic and quality traits of winter barley varieties (Hordeum vulgare L.) under growing conditions in the Republic of Croatia

This paper presents an investigation of the agronomic and quality traits of the barley varieties, their stability and adaptability and specific reactions towards growing conditions in the Republic of Croatia. During four year trials on localities in Tovarnik, Nova Gradiska, Pozega and Osijek we conducted research of 14 winter barley varieties. Interaction effect variety*environment has been explored together with estimation of significant parameters of stability towards grain yield, hectoliter weight, protein and starch content, and with usage of cluster analysis it was possible to group varieties considering genotype x environment interaction (GEI). Impact of year, location and variety to grain yield, hectoliter grain weight, protein and starch content has been estimated by analysis of variance. There was no significant difference between two different sowing rates (300 and 450 grains/m2) for grain yield, hectoliter weight and protein content. There also was no significant interaction of variety*sowing rate for all researched parameters. Parameters of stability and achieved grain yield show that under favorable growing conditions one can expect better results of varieties Trenk and Princ with lower stability and variety Barun with higher stability of grain yield. Stability parameters point out varieties Vanessa, Plaisant, Favorit and Zlatko to have auspicious reaction to grain yield under extensive cultivation conditions but with significantly different levels of grain yield achieved. Cluster analysis for grain yield on highest clustering similarity level displays five variety groups and variety Princ which does not show tendency to group with none of the other varieties. The first group is made by varieties Barun, Zlatko and Rex. The second one consists of varieties Prometej and Gvozd with Bingo and Sladoran. Tiffany and Vanessa make special, somewhat detached group of varieties which tend to group together with varieties Favorit Trenk, Plaisant and Lord but on the lower grouping levels.

barley ; variety ; grain yield ; grain quality ; stability parameters ; cluster analysis

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