Influence of Gamma irradiation and nitrogen fertilizer levels on Gemmeiza-9 wheat cultivar yield and its attributes

الملخص EN

The present study was conducted in an Extension field at Belbees district, Sharkia Governorate during two winter successive seasons, 2007-2008 and 2008-2009 to investigate the influence of four gamma –irradiation doses (0, 10, 20and 30 Gy) and 6 nitrogen fertilizer levels (0, 25, 50, 75, 100 and125KgN / fad,) , on yield and it's attributes of bread wheat cultivar Gemmeiza-9 The obtained results indicated that, wheat grains irradiated with low dose (10 Gy) of Gamma radiation surpassed the other tow irradiation doses (20 and 30 Gy) and the control in each of plant height(cm), spike length (cm), Flag leaf area (cm2) at heading ,number of spikes /m2 , number of spikelets / spike, number of grains / spikelet, grain weight / spike (g) , grain weight /spikelet (mg), 1000- grains weight(g), grain , straw and biological yields /fad.

Each increment in nitrogen supply caused significant increase in each above mentioned yield and yield components studied.