الفهرس 
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Abstract
The present investigation aimed to study the effects of weed control treatments i.e. brominal, granstar, topik, puma super, brominal with topik, granstar with topik, brominal with puma super, granstar with puma super and handweeding twice at 30 and 45 days from sowing on weed growth, as well as wheat growth, some physiological aspects and yield components of wheat plants. Moreover, the effects of weed competition on growth, of both weed and wheat, some physiological aspects and yield of wheat plant as well as to determine the critical period for competition between weeds and wheat plants, were recorded. All weed control treatments increased significantly plant height [cm], number of tillers/plant as well as fresh and dry weight of shoot system per plant [g] in both seasons. Treatments i.e. brominal with topik, granstar with topik, brominal, granstar with puma super, granstar, brominal with puma super and handweeding twice at 30 and 45 days after sowing respectively, gave the best result in this respect compared with other treatments. All weed control treatments caused increased significantly spike length[cm], number of spikes/ m2, 1000grain weight [g], grain weight[g]/spike as well as grain and straw yield per plant [g] in both seasons. In both seasons, fresh and dry weight of total weeds/m2 were decreased significantly with increasing the time of removal weeds from sowing. Weed free for the whole season, weed free for 10,8,6and4 weeks from sowing and weed removal at 4 and 6 weeks from sowing gave the best result in this respect at 60 and 90 days from sowing during the two growing seasons. In both seasons, late weed competition periods decreased significantly crude protein, phosphorus and potassium percentage of grain, as well as nitrogen, phosphorus and potassium percentage of straw in both seasons. Weed free for the whole season, weed free for 10,8,6 and 4 weeks from sowing and weed removal at 4 and 6 weeks from sowing gave the better result in this respect in both seasons. Herbicidal treatment adversely affect the anatomical structure of the leaf of the target weed. Treachery elements were more affected in topiktreated leaves, whereas mesophyll was more sensitive to brominal treatment. Conversely to the effects of the used herbicides on the anatomical structure of the weed leaves, the anatomical features of wheat leaf were enhanced so, leaves of plats to which weed competition was removed possess higher proportions of mesophyll and treachery elements.