Two field experiments were carried out at the Dornonstra
tion fieldg of ICafer Saad. Domietta Governorate in L909 and
1990 seasons to investigat, the effect of seeding rates
(30.40 50.60 and 70 kg/fed) and some weed control treat
ments (un—weeded hand-weeded. th1obenyi bentazon and
thiobenzyl + bentazon) on weed density in broadcast seeded
rice. Dominant w•ods were chinochioa Cru, ji (L
Link and Cyperus diffornj,. t. wh.reas Zchinochloa colonum
L- was also present in small number, and not repeatable in
all replications as well as at different growth stages.
Increasing seeding rates significantly reduced number and.
fresh and dry weights of weeds. Increasing seeding rat. from
30 to 70 kg/fed- caused a significant reductions in number
of total weeds by 05 and 1.5% in the first season and by 57
and 41% in second season, at 90 and 120 days from sowing
respectively Zchinochloa crus gauL was controlled
significantly by thiobeazyl (2.0 1/fed). however bentazon
(1.5 1/fed.) was not effective in controlling this weed at
different growth stages. i.e 30.60 90 and IZO days from
sowing in the both seasons Whereas ا difformis and E
colonum were controlled significantly by both herbicides
Moreover, hand—weeding three time. after 30 60 and 90 days
from sowing, as well as thiobenzyl were the best treatments
whereas bentazon gave poor control of weeds compar•d with
the two previous treatments
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