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A field experiment was carried out at the Experimental Farm, Faculty of Environmental Agricultural Sciences, Rafah, North Sinai Governorate, Suez Canal University, during two successive winter seasons 2011/2012 and 2012/2013; to study the response of 5 canola cultivars to nitrogen bio-chemical fertilization regimes in respect to yield and yield components under North Sinai conditions. Application of nitrogen fertilizer T1 (100% mineral) significantly increased yield/plant, seed yield kg/fed. and oil yield, while, (75% mineral) and (50% mineral) gave the highest 1000-seed weight at both seasons. Serw4 with 100% mineral nitrogen fertilization regimes gave the highest seed yield per plot and high oil percentage. Generally, it could be concluded that the canola cultivar Serw4 and 100% mineral nitrogen fertilization regime gave the heighst yield and can be recommended under North Sinai conditions.

EFFECT OF NITROGEN FERTILIZATION REGIMES ON SEED YIELD AND OIL PERCENTAGE OF SOME CANOLA CULTIVARS