Two field experiments were carried out at the Dornonstration field of Cafer 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 compared with the two previous treatments |
