الفهرس 
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Abstract
Two field experiments were conducted at the Agricultural Research Station, Faculty of Agriculture, Zagazig University at El-Khattara Region, Sharkia Governorate, Egypt, during two summer successive seasons of 2012 and 2013 to study the effect of three plant densities (24000, 28000 and 32000 plant/fad.), four nitrogen fertilizer levels (50, 75, 100 and 125 kg N/fad.) and three organic manure rates (control, 2.5 and 5 ton/fad.) on growth, yield and its attributes of yellow maize (single cross 173).
The tried plant densities had no significant effect on number of ears/plant, ear length and diameter, number of rows/ear, number of grains/row, hundred grain weight and shelling percentage of maize plant. Increasing maize plant density up to 28000 plant/fad significantly increased ear and grain yields/plant as well as grain yield/fad. Results showed a significant decrease in ear, stover and biological yields/fad with increasing maize plant density from 24 or 28 thousand plant to 32 thousand plant/fad. Increasing nitrogen fertilizer level up to 100 kg N/fad significantly increased number of ears/plant, ear diameter, number of grains/row, hundred grain weight, ear and grain yields/plant as well as ear, grain and biological yields/fad of maize plants. Number of rows/ear, shelling percentage and stover yield/fad were not significantly affected by nitrogen fertilizer levels. Organic manure rate was without significant effect on ear diameter and shelling percentage of maize plants. The yellow maize plants furnished with 5 tons organic manure/fad outyielded those furnished with 2.5 tons organic manure/fad or those of without organic manure application in ear length, number of rows/ear, number of grains/row, hundred grain weight, ear and grain yields/plant as well as ear, grain, stover and biological yields/fad.
The obtained data showed that maize plants received 100 kg N/fad., and 5 ton organic manure /fad., under light density (24000 plant/fad.) and medium density (28000 plant/fad.) produced the higher grain yield/fad. While, under the high density (32000 plant/fad) grains yield/fad was higher when 75 kg N/fad., and 2.5 ton organic manure/fad was applied.