الفهرس 
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Abstract
The present study was carried out at the Agricultural Experimental Research Station, Faculty of Agriculture, Alexandria University during the two summer seasons of 2015 and 2016.
The main objective was to study the effect of six main factors (irrigation, fertilization with various macro elements, i.e. phosphorus, potassium and nitrogen; sowing date and plant density) on growth characteristics of the maize plant, grain yield and yield components and grain protein content of cultivar Giza 168.