Production response of four varieties of barley to different levels of nitrogen

الملخص

A field experiment was carried out in the experimental farm, college of Agriculture and Veterinary Medicine, Thamar University during two seasons 2008-2009 and 2009-2010 by using the design of spilt plot only one time in RCBD with three replications. The barely varieties were assigned as (Ary1, Ary3, Moasasah21 and Moasasah23) randomly on main plots and nitrogen levels (0. 40, 80 and 120) kg/h in split plots, the results indicated that the variety of Moasasah23 was the best in both seasons which gives the highest value in number of spikes/m2, biological yield, grain yield and harvest index. Also, Ary3 was better than other varieties in the number of kernels/spike in both seasons, and the nitrogen level 120 kgNlh was better than other nitrogen levels in the first and second seasons which gives the highest value for number of spikes/m2, weight of 1000 kernels (g), biological yield, grain yield and harvest index. While the reaction between Ary3 and nitrogen level 120 kgN/h gives the highest in number of kernels/spike in both seasons. Also, the reaction between Ar3 and nitrogen level 120 kgN/h the highest in weight of 1000 kernels in both seasons.