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24 Agriculture 7(2001)
STABILITY AND ADAPTABILITY OF SEVERAL SOYBEAN OS-CULTIVARS IN
THE GRAIN YIELD
SUMMARY
The main objective of this study was to evaluate the level and stability of grain yield and adaptability of several domestic
soybean cultivars. Trials were conducted on the experimental field of the Agricultural Institute Osijek during five years
(1996-2000) and involved 14 soybean cultivars: Kaja, Una, Iva, Ilova, Lika, Drina, Tisa, Vuka, Nada, Podravka 95, Kuna, Ika,
Anica, Kruna. All tested cultivars were created in soybean breeding programme at the Agricultural Institute Osijek. Data for
grain yield were subjected to analysis of variance followed by LSD test. Stability of grain yield for each cultivar was estimated
by three parameters: regression coefficient (b i ), ecovalence (W i ) and portion of genotype x environment variance due
to the contribution of each genotype to total variance of genotype x environment interaction (S 2 GxY). Correlations between
grain yield and stability parameters as well as among stability parameters were calculated. The summarised results indicate
significant variation in level and stability of grain yield and adaptability of cultivars. Among 14 tested cultivars, six
cultivars: Ika, Podravka 95, Anica, Kuna, Tisa and Drina had high and stable grain yield and wide-general adaptability. Correlation
between grain yield and stability parameters has indicated that simultaneous selection on high and stable grain
yield is possible. Very high significant positive correlation between parameters W i and S 2 GxY indicate using of smaller number
of parameters for stability estimation of grain yield without reduction of the estimation accuracy.
Key-words: soybean, cultivar, grain yield, stability, adaptability, correlation