T he present study was conducted during 1998/99 and
1999/2000 seasons to estimate the type and relative amount
of genetic variance components and their interactions with
experimental conditions for yield and yield components in faba
bean. A half diallel set of crosses involving seven parental
varieties namely, Giza blanka (P1), Giza-717 (P2), Triple white
(P3), Giza-643 (P4), Giza-46l (P5), Moshtohor-109 (P6) and
Moshtohor-103 (P7) were utilized under two experimental
conditions, the first was normally irrigated at once every 45
days in addition to the amount of rainfall, and the second, dry
method of sowing was used with one supplemental irrigation at
sowing, then plants were left to grow under rainfall conditions.
The parents and their 21 F1-crosses were evaluated in a
randomized complete block design with three replications in
Maryout Research Station, Alexandria Govemorate. Data were
recorded on individual plant mean basis and analyzed by the
procedure developed by Griffing (1956) as model-i method-2.
The combined analysis was calculated for the two experimental
The obtained results could be summarized as follows:
Mean squares of genotypes parents, cftsses and parents vs.
crosses were highly significant for stress susceptibility index
(SI) of yield and its components except parents vs. crosses for
SI for number of pods/plant and 100-seed weight. The mean squares associated with general and specific combining abilities were significant for SI of yield and the three yield components. Also, low general I specific-combining ability (G.C.AJS.C.A.) ratio of less than unity were detected for number of seeds/plant, seed yield/plant and 100-seed weight. The parental cv. Giza-461 (P5) seemed to be the best combiner for SI of number of seeds and seed yield/plant.