‫الرابع‬ ‫العــذد‬ ‫السابــع‬ ‫الوجلــذ‬ ‫الزراعيـــت‬ ‫للعلــوم‬ ‫الكوفــت‬ ‫هجلــت‬ 5102 Wheat cultivars evaluation by agronomic traits, application of three nitrogen levels and nitrogen efficiency parameters ‫الرابع‬ ‫العــذد‬ ‫السابــع‬ ‫الوجلــذ‬ ‫الزراعيـــت‬ ‫للعلــوم‬ ‫الكوفــت‬ ‫هجلــت‬ 5102

Hussein Mahsen, Murtadha Al-Bakka
unpublished
Ten wheat cultivars (cv.) and three nitrogen levels were used in this field experiment which was conducted at the University of Kufa, Faculty of Agriculture, during the winter season of 2013.. The aim of this experiment was to compare ten wheat cv. toward agronomic traits, nitrogen levels application and nitrogen efficiency parameters. The 1 1. The wheat cv. were selected to represent the experimental materials and they are listed in Table 1. All agronomic traits values (plant height PLH, spike
more » ... length (SL), tillers number (TN), life tillers number (LTN), stem dry weight (SDW), leaf dry weight (LDW), grain dry weight (GDW) and total weight (TW) were increased as the nitrogen application levels increased. Root dry weight RDW behaved differently in which RDW increased with decreasing nitrogen availability in soil. Results revealed that total dry matter produced per unit nitrogen absorbed NE 1 averaged over the ten wheat cv. increased where ever the availability of nitrogen in soil reduced. The NE 1 values was 60.91, 50.03 and 45.39 under nitrogen levels of Zero, 200 kg. 1 and 400 kg 1 , respectively. Similar trends were observed toward total grain yield per unit nitrogen absorbed NE 2 and NE 3 , which was the product of the ratio of grain nitrogen to stover nitrogen, times NE 2. The ratio of grain nitrogen to stover nitrogen TEFF was represented transfer efficiency. TEFF value behavior was different, in which its value increased as nitrogen level increased in soil. Results also showed significant differences among wheat cv. toward NE 1 , NE 2 , NE 3 and TEFF.. Sham 9 cv. had the highest NE 1 value (61.518) while Tamous 2 gave the lowest (47.173). Sham 9 and Tamous 2 behaved in the same manner toward NE 2 and NE 3. The ranking of wheat cv. toward TEFF was different and sham 9 which was one of the highest in NE 1 , NE 2 , and NE 3 came the last in TEFF. It could be concluded that cv. with low values of NE 1 , NE 2 and NE 3 are not necessarily have low grain yield.
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