الفهرس 
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Abstract
Two field experiments were conducted at the Experimental Farm of Gemmeiza Agriculture Research station, Agricultural Research Center (ARC), Egypt during summer growing seasons of 2011 and 2012 to study the effect of three planting densities (20, 24 , and 28 thousand plant/fad.) and two missing irrigations (the 3rd and 5th irrigations 45 and 75 days from planting or missing the 4th and 6th irrigations 60 and 90 days from planting) out six irrigations normally scheduled at 15 days intervals on yield potentiality of four maize hybrids (S.C. 10, S.C. 173, T.W.C. 324 and T.W.C. 352). Concerning the obtained results, the combined analysis revealed that applied six irrigations (normal irrigation) gave the highest means of the different studied characters (days to 50% tasseling and silking, leaf area index, stem diameter, chlorophyll content, plant height, ear height, ear length, ear diameter, number of rows/ear, number of kernels/row, thousand grain weight, grain yield ard./fad., biological yield ton/fad., and grain protein content), meanwhile, skipping the 3rd and 5th irrigations at 45 and 75 days from planting gave lowest means. But the reverse was true for protein content, where plants irrigated with missing the 4th and 6th irrigations at 60 or 90 days from planting had higher protein content followed by those received irrigation with missing an irrigation either at 45 or 75 days from planting whereas the lowest values were obtained from plants irrigated normally. In pooled data, irrigation skipping at 3rd and 5th irrigation and skipping at 4th and 6th irrigation caused significant reduction in grain and biological yields/fad., which reached to 17.54 and 9.75% as well as 10.36 and 11.19% compared with normal irrigation, respectively.