Two field experiments were carried out at the
Agricultural Research and Experimental Center, Fac, of
Agric. at boahtohor, Ealubia, Egypt, during 1984/85 and
1985/86 seasons to evaluate the efficiency of 13 weed control
treatments in controlling the weeds and to elucidate their
effect on yield and yield components of wheat.
All applied herbicides a. well as hand weeding treat—
sent. significantly reduced the number and dry weight of
weeds/rn’ as compared with unweeded treatment, after 50,
65 and 80 days from wheat sowing. Brominal, lontrel 526
and lontrel 100 at higher rates were more efficient in
controlling weeds than at lower rate.. Dosanex at a rate
of 1 kg, bromex at 1 L, arelon at 1.25 L and brorninal at
1 L/fed. surpassed the other weed control treatments.
Herbicides with low efficiency in weed control of wheat
were lontrel loo at 0.25 L and illoxan at 1.25 L/fed.
Weed control treatments did not affect stem length,
number of tillera/m’, number of spikes/rn’, spike length,
spike weight and straw yield/fed. On the other hand, chemical
weed control as well as hand weeding significantly increased
spike weight/rn’, 1000—grains weight, harvest index and
grain and biolojical yield/fed. Lontrel 100 at 0.50 L,
bromjnal at 1 L, arelon at 1.25 L, dosanex at 1 kg, bromex
at 1 L, lontrel 526 at 1 L and 0.75 L/fed. increased grain
yield, by, about 39, 38, 37, 37, 35, 30 and 29% over the
unweeded check, respectively.