الفهرس 
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Abstract
The present study was carried out at Om-Elzain village, Zagazig, during winter sowing seasons of 2017-2018 and 2018-2019. The study aimed to assess yield response of diverse wheat cultivars to different P levels and N forms for identifying the appropriate management to improve wheat productivity under semiarid conditions. The experimental design was laid out in spilt-split plot design with three replications. The phosphorus levels were specified to the main plots, wheat cultivars were randomly distributed into subplots and nitrogen forms were randomly allocated in sub‐subplots. Two phosphorus levels (15.5 and 31 kg P2O5/fed) versus non-added control, three high-yielding commercial cultivars (Shandawel-1, Sids-14 and Sakha-95) and three nitrogen forms (urea 46%N, ammonium sulfate 20.5% N and ammonium nitrate 33.5%N) at a rate of 80 kg N/fed were evaluated. The measured traits were; flag leaf area, days to maturity, plant height (cm), number of spikes/m2, spike length (cm), number spikelet/spike, number of grains/spike, 1000-grain weight (g), grain yield (kg/fed) and biological yield (kg/fed).
The results could be summarized as follows:
A. Yield attributes
A.1. Flag leaf area (cm2)
1. Raising the P level to 31 kg P2O5/fad produced significant increase in flag leaf area in both seasons, while 15.5 kg P2O5/fad was not quite enough to produce larger flag leaf area.
2. Sakha-95 followed by Sids-14 exhibited the highest values.