TY - JOUR ID - TI - RESPONSE OF SOME BARLEY CULTIVARS TO DIFFERENT LEVELS OF NITROGEN FERTILIZER أستجابة بعض اصناف الشعير لمستويات مختلفه من التسميد النايتروجيني AU - Z.K. Al-Shugeairy Nadhim Dakhil mhawes زينب كريم كاظم ناظم داخل مهاوش PY - 2017 VL - 9 IS - 1 SP - 153 EP - 166 JO - Euphrates Journal of Agricultural Science مجلة الفرات للعلوم الزراعية SN - 20723857 AB - An experiment was carried out in Afak district – Al-Diwaniyah province during the growing winter season 2015-2016 to study the effect of three levels of Nitrogen fertilizer on four barley (Hordeum vulgare L.) cultivars. A factorial experiment was carried out using Randomized Complete Block Design (RCBD) with three replications. The experiment involved the study of two factors; first it included four varieties of barley (Ibaa 99, Ibaa 265, Behooth 244 and Samer). The second factor included three levels of Nitrogen fertilizater 150, 200 and 250 kg urea. ha-1. Nitrogen was added in the form of urea (46% N) in two portions, the first was added at seeding and the second when flowering. Seeding was done in the 11 -December -2015. The studied traits were: plant height, mean of flag leaf area, and number of tillers, number of spikes, the average number of grains in the spike, the weight of 1000 grains, biological yield of the plant and total grain yield. The results showed that the third level (250 Kg urea .ha-1) significantly performed better than the first level (150 Kg urea ha-1) and the second level (200 Kg urea. ha-1) in all studied traits, as it was performed the best in plant height (88.08 cm), flag leaf area (13.66 cm2), number of tillers (842 tillers in square meter), number of spikes (0727.5 spikes in square meter), average number of grains in spike (45 grains in spike), weight of 1000 grain (41.08 g), weight of biological yield of the plant (31.02 Mega gram ha-1) and total grain yield (2.31 Mega gram. ha-1). Samer variety performed better than other varieties, where it was the best in plant height (86.22cm) and in spike number (700 spikes in square meter). Interaction between two factors (variety and nitrogen levels) was significant, where the combination of the variety Ibaa 99 grown in nitrogen level (250 Kg urea. ha-1) performed the best in number of tillers (980 tillers in square meter), number of spikes (786.7 spikes in square meter), average number of grains in spike (47.33 grains) and total grain yield (3.21 Mega gram. ha-1).

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