الفهرس 
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Abstract
The present investigation was conducted at the Experimental Farm,
Faculty of Agriculture (Saba Basha), Alexandria University, Egypt, during
the two successive summer seasons of 2018 and 2019, to study the
response of maize to plant population density, nitrogen fertilizer levels and
their interaction at factorial experiments (two factors) in randomized
complete block design (RCBD). Whereas, the first factor was plant
population density (100000, 75000, and 50000 plants/ha), while, the second
factor nitrogen fertilizer levels (216, 288, 360, and 432 kg N/ha).
The obtained result could be summarized as follow:
5.1. Growth characters:
• Planting maize hybrid with 75000 plants/ha higher value for plant
height, while the lowest plant population density 50000 plants/ha
which gave the lowest ones in the first and second seasons.
• Increasing nitrogen fertilizer level up to 432 kg/ha, increased plant
height (cm) followed by the levels of nitrogen fertilization at 360 and
288 kg/ha which had significant difference between the higher level
in comparison with 216 kg N/ha.
• The highest mean values of plant height (cm) were obtained under
75000 plants/ha combined with 432 kg N/ha which had no
significant difference between it and the level of 360 kg N/ha. While,
planting maize under 50000 plants/ha with 216 kg N/ha gave the
lowest ones in both seasons.
• Sowing maize hybrid with 75000 plants/ha higher value for dry
matter accumulation (g/m2) followed by 10000 plants/ha as
compared with 50000 plants/ha which gave the lowest ones in the
first and second seasons.
• Increasing nitrogen fertilizer level up to 432 kg/ha, significantly,
increased dry matter accumulation (g/m2) followed by 360 and 288
kg N/ha which had significant difference between the higher level in
comparison with 216 kg N/ha.
• The highest mean values of dry matter accumulation (g/m2) were had no significant difference between it and the level of 360 kg N/ha.
In the contrast, planting maize under 50000 plants/ha with 216 kg
N/ha gave the lowest ones.