الفهرس 
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Abstract
Two field experiments were conducted during 2012 and 2013 seasons at the Agricultural Experimental Farm of Suez Canal University at Ismailia in the first season and El-Manayf district in the second season in Ismailia Governorate to study the effect of four nitrogen fertilization treatments namely 25, 45, 65 and 25 Kg N/fad plus biofertilizer (Cerealin) as well as three plant densities namely 46666, 35000 and 28000 plants/fad resulted by sowing sunflower in ridges 60 cm in width and hill spacings 15, 20 and 25 cm on sunflower Sakha 53 variety in sandy soils.
Increasing nitrogen fertilization up to 65 Kg N/fad significantly increased all growth characters, yield attributes as well as seed, biological and oil yields/fad.
Applying biofertilizer (Cerealin) plus 25 Kg N/fad significantly surpassed 25 Kg N/fad alone in the above characters.
Decreasing hill spacing up to 15 cm significantly increased seed, biological and oil yields/fad.
The highest seed, biological and oil yields/fad were obtained by adding 65 Kg N/fad under dense planting of 46666 plants/fad.
Key words: Sunflower – Nitrogen – Biofertilization – Plant density.
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