Two field experiments were conducted at Shandawill Research Station. Sohag governorate during 1999/2000 and 2000/2001 seasons. The aim of this
investigation was to study the effect of three plant population density i.e 16.7, 33.3
and 50 plants/m² on the performance of two faba bean cultivars i.e. (Giza 3 and Giza
674) on seed productivity as will as yield components. A spilt plot design with four
replications was used. The main findings could be summarized as follow: The results indicated that plant population density of 16.7 plants/m² gave the
highest values of number of branches/plant, number of pods/plant, 100-seed weight
and seed yield/plant, while plant population density of 33.3 plants/m² gave significant
increase in plant height, first earin~ pods height and seed yield/fed, however, the plant
population density of 50 plants/m gave highly significant increase in plant height, first
earing pods height and seed yield/fed. Increasing plant population density from 16.7
plants/ m² to 50 plants/ m² caused decreases with the two varieties used in number of
branches/plant, number of pods/plant, 100-seed weight and seed yield/plant. Sown Giza 3 cultivar gave heaviest of 100-seed weight with all plants
populations used, while Giza 674 gave highest number of branches and pods per
plant, seed yield/plant and seed yield/fed. The interaction between plant population density and cultivars significantly
affected plant height, number of branches per plant and seed yield per plant. The
results indicated that tallest plants produced from sown Giza 674 cultivar at higher
plant population density of 50 plants/rn''. Highest number of branches/plant and seed
yield per plant are obtained from sown Giza 674 cultivar at lower plant density of 16.7
plants/m² It could be recommended that for maximizing faba bean seed yield might
attributed with sown Giza 674 cultivar at higher plant population density of 50
plants/m"