Response of Four New Bread Wheat (Triticum aestivum L.) Cultivars to Nitrogen Fertilizer Levels under Sprinkler Irrigation System in Sandy Soils

TWO FIELD experiments were carried out in the Experimental Farm of Faculty of Agriculture in El-Khattara Region, Zagazig University, Egypt during two successive winter seasons (2009/2010–2010/2011). The experiments aimed to study the response of some new bread wheat cultivars (Egypt 1, Sakha 94, Sids 12 and Sids 13) to nitrogen fertilizer levels (50, 75 and 100 kg N/fed) under sprinkler irrigation in sandy soils.
Results could be summarized as follows:
1-Significant differences were detected among the four wheat cultivars in all studied characters during the two seasons and their combined analysis. Where, wheat cultivar Sids 13 followed by Sids 12 and Egypt 1 recorded the highest values regarding spike length (cm), number of spikelets per spike, number of grains per spike, grain weight (gm) per spike and grain yield (ardab per fed), while wheat cultivar Sakha 94 gave the lowest values in all aforementioned traits except plant height in both seasons and their combined analysis.
2- The increase of N level from 50 to 75 and up to 100 kg N/fed led to significant increase in aforementioned characters in both seasons and their combined analysis.
3- Grain yield reached its maximum values, i.e. 11.4 and 11.8 ardab per fed when plants were fertilized with 112.5 and 93.6 kg N per fed for both wheat cultivars Sids 12 and Sids 13,respectively. The results , further indicated that, optimum yields were 10.83 and 11.74 ardab per fed and could be obtained when 75 and 78.9 kg N per fed were added for both wheat cultivars Sids 12 followed by Sids 13, respectivley.