| Abstract: |
Two field trials were excuted in the Agricltural Research Station (Ghazala Site), Fac. of Agric., Zagazig Univ., Egypt during the summer season of 2009 and 2010 to evaluate the response of three yellow maize hybrids response to three planting densities (30, 25 and 20 thousand plant/fad), three N fertilization levels (40, 80 and 120 kg N/fad) and their interactions. A split-plot arrangement with three replicates was used in this study, where both cultivars and planting density combinations were kept in the main plots, but the sub-plots were occupied by the three N levels. The net area of each sub-plot was 12.6 m2 (4.2 x 3 m) having 6 ridges of three m long and 70 cm width.The three cultivars varied markedly as for all growth, yield attributes and yields/fad, where the TWC 352 recorded greater mean averages regarding LA/plant, LAI, stem weight, ear diameter, number of rows/ear and grain index. At the same-time, the SC 166 was inherently superior regarding the rest of ear characters and the final yields/fad from ear, stover, biomass and grain.In addition, the three planting densities detected marked alteration in most growth characters, yield parameters and the final yields/fad, where the thin planting stand of 20 000 plant/fad had greater averages in LA/plant and most of ear characters tested. But, reversal trend was given as for the densest planting density of 30 000 plant/fad, where its pronounced effect was prone on raising the final yields/fad from ear, stover, biomass and grain.Moreover, N fertilization levels exhibited marked changes in all the studied characters, where the 40 kg N level gave greater averages in both harvest and crop indices. Moreover, the highest N level of 120 kg N/fad was most effective in raising all growth traits, ear characters and the final yields/fad from ear, stover, biomass and grain.
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