This research was Carried out during two seasons 2009/10 and 2010/11 at fields of the National Center for
Agricultural Research and Extension, it was belong to Ministry of Agriculture in Karak southern Jordan and to study the
response of four varieties of barley are Yermok, Athroh, Rum and Acsad-176 to the effect of four seeding rates of 50,
100, 150 and 200 kg/ha and five levels of nitrogen (N) fertilizer 0, 15, 30, 45, 60 kg/ha on plant length, spike length,
protein percentage and some phenological characteristics. Results of the study showed that the values of all the studied
indicators decreased in the second season due to moisture stress rather than in the first season for the second , and vice
versa , according to the performance of the product and the degree of adaptability to drought conditions. Variety
showed bilateral rows Yermok a high degree of consistency and stability to the contrary from other varieties hexagonal
rows. Athroh cultivar took high values for spike length; although it was bilateral rows and access to full maturity in a
shorter period of time (131 and 117 days) in the first and second seasons, respectively. Rum cultivar surpassed other
varieties and gives higher values for plant length and took longer time to reach full maturity (144.63 and 127.3 days) in
the first and second seasons, respectively. The effect of seeding rate was significantly influence on the phenological
characteristics but its effect was not significant in indicators yield, knowing that the best values of these indicators have
been achieved in the seeding rate 100 kg/ha. N level 45Kg/ha gave the highest value for the protein percentage.