Two field experiments were conducted to determine
the effect of three seeding rates (30, 50 and 70 kg/fed..)
and five weed control treatments (Brominal 0.75 L; Herbogil
2,.0 L; Fenuron 0..75 kg/fed..; two hand weeding and a control
treatment) on yield and yield components of wheat variety
Giza 157 and associated weeds. The two experiments took
place in 1979/80 and 1980/81 seasons, at the Research and
Experimental Center of Moshtohor, Faculty of Agriculture,
Zagazig University.. The Obtained results showed that increa
sing seeding rate from 30 to 70 kg/fed.. significantly decrea
sed the fresh weight of weeds by 36..4% and the dry weight
by 46.0% after 100 days from sowing.. Wheat plant height,
grain and straw yields were increased significantly by
increasing seeding rate up to 50 kg/fed.. However, the spike
weight was decreased by increasing seeding rate. The number
of tillers and spikes/rn2 and 1000—grain weight were stable
over the three seeding rates utilized in this study.. With
respect to the effect of weed control, the three herbicides
as well as twice hand weeding decreased the fresh and dry
weight of weeds significantly at 100 days after planting..
Wheat plant height, grain weight/spike and 1000-grain weight
were significantly increased by weed control treatments.
The herbicides used as well as hand weeding increased grain
and straw yields/fed.. Brominal (0.75 (L../fed,.) gave the
highest grain and straw yields/fed.. and decreased both
fresh and dry weights of weeds better than the other treat
ments.. The effect of the interaction between seeding rates
and weed control treatments was not significant on any
of the characters included in this study..