الفهرس 
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Abstract
A field experiment was carried out at Shandaweel Agricultural Research Station, Sohag Governorate, Egypt, during each summer season 2010, 2011 and 2012. This investigation was conducted to study the effect of foliar spray of some activators (salicylic acid, humic acid as K- humate and cheleated zinc) under three levels of nitrogen fertilizer (N: 0, 90, and 120 kg N feddan-1) on two maize hybrids (Single Cross Pioneer 30K09 and Three Way Cross- 310) as promoting effect, under nitrogen fertilizer levels on some morphological criteria, physiological activities, some biochemical constituents, nutrient contents as well as yield and its components of two