Quantitative and qualitative stability of winter wheat varieties at various experimental sites

The present study was conducted to analyse the adaptability of 34 state-reg istered winter wheat varieties tested in small-plot comparative trials by t he National institute for Agricultural Quality Control (NIAQC) based on the ir grain yield, gluten quantity and farinographic value. For the comparison of the varieties the evaluation method of Eberhart and Russell (1966) was applied as modified by Bedo and Balla (1977). According to this meted the v arieties can be divided into three groups: varieties with special, good and average adaptability. The study proved that the stability and adaptability values of the varieties differ from the adaptability and stability values calculated from the grain yields. The other aim of the present work was to determine the reaction of state re gistered winter wheat varieties to different soil conditions. The gluten qu antity and farinographic value of the varieties tested at the NIAQC experim ental stations - which belong to different soil types - were evaluated, By analysing of the database it was proved that the varieties do not respond i n the same way to different site conditions. Therefore, in the future they should be selected for production based on the given conditions and on thei r responses.