الفهرس 
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Abstract
This investigation studied the influence of organic acids, i.e., humic and
fulvic acid, Azospirillum spp. as biofertilizes and mineral fertilizer,
potassium on growth of Valencia orange seedlings. Field experiment was
conducted during the two successive season of (2009-2010)and (2010-
2011) at the organic farm of the Environmental Studies and Research
Institute (ESRI), Minufiya University at Sadat city; Minufiya governorate;
Egypt.
Fifty five seedlings (3 years old) of Valencia orange were selected.