Water-Use Efficiencyand Ammonium -N Source Applied ofWheat under Irrigatedand Desiccated Conditions

Pot experiment laid out to study the effects of watering, nitrogen fertilization, and their interactions on the growth, dry matter production and water use efficiency of two cultivars(Egyptian Sakha94 cult ivated in 2009/2010 season and Turkish Adana99 cultivated in 2010/2011 season) of wheat. The experiment laid out in randomized complete design. Cultivars were grown in pots at the greenhouse of the Faculty of Life and Environmental Science, Shimane University during 2009/2010 and 2010/2011 growing seasons. Two watering levels started after booting stage (well -watered and desiccated) and five nitrogen fertilization levels0.0, 0.24,0.48,0.72 and 0.96g pot -1 (0.0,