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Abstract
In this study, two field experiments were carried out in the experimental farm belonging at Inshas, Plant Research Department , Nuclear Research Center, Atomic Energy Authority, Egypt, during the two growing seasons 2007 and 2008 to study the effect of plant spacing and nitrogen fertilization on some sunflower genotype characters. The first experiment included four genotype i.e., mutant line 4, mutant line 11, Sakha 53 and Giza102 and three planting spaces i.e.,20,30 and 40 cm between hills. The second experiment included the same genotypes and three levels of nitrogen fertilization i.e., 25, 50 and 75 KG N/fed. N fertilizer was in the form of ammonium nitrate (NH4NO3) 33.5% Each separated experiment included twelve treatments were arranged in split plot design with three replicates.