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The experiment was carried out in two vegetation seasons of 2009-10 and 2010-11. The main purpose of the study was to determine the effects phosphorus doses (a control-0, 30, 60 and 90 kg/ha) on grain yield, P use efficiency, P uptake and P utilization of some bread wheat cultivars (Gerek-79, Gun-91, Harmankaya, Altay-2000, Yildiz and Sultan) under the semi-arid climatic conditions. The experiment was set up according to a randomized complete block design in a split-plot arrangement with three replicates, where phosphorus doses were main plots, while the wheat cultivars were in sub-plots split within main plots. Of the phosphorus doses, while the highest grain yield, the highest P use efficiency and the highest P utilization efficiency were determined from the 60 and 90 kg/ha P doses, the highest P uptake efficiency was obtained from the 30 kg/ha P dose in both 2009-10 and 2010-11. Of the wheat cultivars, the highest grain yield, the highest P use efficiency, the highest P uptake and the highest P utilization were obtained from Altay-2000 and Gun-91 cultivars. Of the interactions between the P doses and the wheat cultivars, the highest grain yield (2494 and 3649 kg/ha, respectively), the highest P utilization efficiency (193.7 and 190.1%, respectively) were obtained from the 60 and 90 kg/ha, respectively, in Altay-2000 in both 2009-10 and 2010-11. The highest P use efficiency was obtained from the 60 kg/ha in Gun-91 cultivar (34.8%) during 2009-10 and Altay-2000 (36.4%) during 2010-11. The highest P uptake efficiency was determined from the 30 kg/ha in Gun-91 cultivar (52.8 and 44.9%, respectively) in both the years. |
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