Seeds of faba bean (Giza 461) were submitted from Gene Bank. Agricultural
Research Center. Giza and used in this investigation. Faba bean was cultivated unde j
djffer~nt irrigation systems (subsurface dr.p. surface drip, center pivot. solid se
sprinkler and modified surface Irrigation by using gated pipes). Four levels of water
amounts were applied to the plants at recommended irrigation intervals of Ihe differen
irrigation systems used In this investigation. These four amounts were 50. 75. 100 an
125% of the calculated water consumption USe (ETc). All plots were harveste
manually and the harvested plan Is were subjected to air drying. then. faba bean pod
and seeds were separaled manually. From results Obtained the seed volume WQ
significantly affected by irrigation system. water requirement and their interaction
whereas. seed volume increased as water requirements increased. Seed volum
increased gradually from 647 to 790 mmJ as water requirements increased from 50%
to 125% of ETc. Subsurface drip irrigation system gave the greatest geometry diamete{
of 9.3 mrn. Only water requirement and its interaction with Imgalion system showed
significant effects on seed sphericity percentage. Values of hecto/itre weight varied as
affected by Irrigation system since modified surface irrigation system gave Ihe grealest
value recorded (722 gIL). Higher seed moisture content of seeds were produced unde
sprinkler and pivot Irrigation systems (16.4 and 16.0%) . these high moisture content
was due to the high I'Iumidity over It\e plant canopy during the irrigalion process.
Weight of 1 00 seeds increased significantly by Increasing amounts of Irrigation water
up to 100 % of ETc (60.4 g). Irrigation system had s!gniflcant effect on Ihe angle ot
repose. Seed friction coefficient decreased from 0.379 to 0.363 by increasing water
requirement from 50% to 125% of ETc. Irrigation system had significant effect on seed
germination .. lJ1e greatest germination percentage was 94.7% for seeds produced
under modified surface Irrigation system. while the smallest genninatfon percentage
was 89.3% under pivot system. On the other hand. the lowest percentage of vigor was
75.2% under subsurface drip irrigation. while the highest percentage was 82.3% when
using pivot irrigation system.