The trial was carried during 2011-2013 on the second
experimental field of the Institute of forage Crops-Pleven, Bulgaria.
Populations of P1, P2, F2 and F1 of
the crosses Shtambovii × Pleven 10 and Rosacrono × Pleven 4 and their
reciprocals were investigated. Heterosis for the investigated traits was found
in the hybrids of F1 generations. The cross Rosacrono × Pleven 4 had the highest positive true heterosis for plant height (31.54%),
height to first pod (15.44%) and pod length (17.11%); the cross Shtambovii ×
Pleven 10—for nods per plant (56.10%) and pod width (20.38%); Pleven 10 ×
Shtambovii—for 1000 seeds mass (14.65%) and Pleven 4 × Rosacrono—for number of
seeds per pod. In F2 the plants from Rosacrono × Pleven 4 had the strongest
depression for plant height (28.26%), height to first pod (27.74%) and pod length (18.13%);
Shtambovii × Pleven 10—for 1000 seeds mass (32.22%) and number of seeds per pod
(13.87%). The stability of the studied characters was determined. Their
variation in F1 in the hybrid combination between Shtambovii andPleven10 was higher than F1 of Rosacrono and Pleven 4. For more traits in
direct crosses variability was found to be lower
in relation to the reciprocal crosses in both combination. The genetical part in phenotipycal expression for height to first pod
(Pleven 10 × Shtambovii), pod length and number of seeds per pod (Pleven 4 ×
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