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Abstract Responses of canola (Brassica napus var. serw4) vegetative growth, yield attributes and chemical composition to three irrigation intervals (irrigation every; 11=5, 12=7,13=9days) , three nitrogen fertilizer rates (Nl=30, N2 =45, N 3=60 kg N fed.”) and three potassium fertilizer rates (K1=40, K2= 50, K3= 60 kg K20 fed.”) in 200712008 and 2008/2009 winter seasons. Were investigated at Experimental Farm, (FEAS), El-Arish, Suez Canal University, North Sinai Govemorate. Results showed that water stress exerted a significant impact on growth and yield parameters of canola plants. The highest mean values of plant height, number of racemes and leaves per plant and number of days to the 50% flowering, racemes/plant, siliqua/plant, yield/plant and weight of 1aaa-seed as well as seed yield were found when canola plants irrigated every 7 days, while the highest seed oil content was obtained when canola plants exposed to water stress (12). Most of yield components and seed yield were enhanced with nitrogen and potassium fertilizer application up to 45 kg Nand 50 kg K20 per feddan, respectively. The highest seed oil content and lowest seed protein content were obtained when canola plants were fertilized with N2 and K3treatments. from this study, maximizing canola yield under North Sinai conditions can be obtained by irrigating canola plants every 7 days and fertilized by 45 kg Nand 60 kg K20 fed-I. |