الرابطي, هشام2025-09-052025-09-052015https://dspace.omu.edu.ly/handle/123456789/491Two field experiments were conducted during (2013-2014) and(2014-2015) growing seasons using bread wheat cultivars, namely (Slambo, Sham10, and Ebo Elkhaer) at Gandoolla region to study the response of various growth characters, yield, and yield components of the wheat cultivars, as influenced by the application of nitrogen fertilizer levels (0, 70, 140, and 210 kg/ha). Asplit - plot design with three replicates was used planting dates were November 15, 2013, and November 15, 2014 for the First and Second experiment, respectively. Genetic behavior investigated by determine the genetic variation effiencey GCV, phenotypic variation PCV, the wide sense heritability H² and expected genetic advantage. GA. 2 Results revealed revealed that a significant differences in most crop traits due to cultivar Slambo give the hieghest comparing to sham10 cultivar and the N - level 140kg ha exhepted the greatest value comporing to unfertilized treatments. the traits: plant height, bearing tillers, biological yield, harvest index and Seed index reaveled the most traits impact in crop yield must be included in breeding programs for increasing breadotherThesis