ABSTRACT
Two field experiments were conducted at the Agricultural Experimental Station of the National Research Centre at Shalakan. Kalubia Governorate, during the two seasons 1994/1995 and 1995/1996 for studying the effect of some herbicides on two wheat [Treticum aestivum L.] cultivars and associated weeds. The herbicides, Bromoxynil/Clodinafop-propargyl at a concentration 135, 225 and 315 g a.i./fed., as well as, Metosulam at 8 g a.i./fed., Diflufenjcan/Bromoxynil at 220 g a.i./fed. Hand pulling gave the best control of total annual weeds. The higher values of chlorophyll a, b, carotenoids and total pigment were obtained from hand pulling treatment, Bromoxynil/ Clodinafop-propargyl at 135 g a.i/fed., Metosulam at 6, 8 g a.i./fed. and Diflufenican/ Bromoxynil at 165 g a.i./fed. The lower values of chlorophyll a, b, carotenoids and total pigment, were obtained from the unweeded treatment and the highest rate [315 g a.i./fed.] of Bromoxynil/cloclinafop-propargy1 as well as, Metosulam at the lowest dose [4 g ai/fed.]. Giza 164 gave higher grain yield than Sakha 69. Also, results showed that the highest values of these characters was obtained with hand pulling, Bromoxynil/Clodinafop-propargyl at 135 g a.i./fed., Metosulam at 8 g a.i./fed. and Diflufenican/Bromoxynil at 165 g a.i/fed. The higher grain yield of the two cultivars were observed, when combined with hand pulling, Bromoxynil/wclodinafop-propargyl at lower dose [135g a.i/fed.], Metosulam at highest dose [8 g a.i./fed.] and Diflufenican/ Bromoxynil at medium dose [225 g a.i/fed.] in the two seasons. Giza 164 was the best when the manual weed control method [hand pulling] was used, whereas, when chemical weed control was used it prefers Sakha 69