A field study was carried out in the Agricultural Research and Experimental Center, Faculty of
Agriculture at Moshtohor, Kalubia Governorate, Benha University, Egypt during 2006 and 2007 seasons.
The aim of this study was to assess influence of nitrogen sources i.e. 120 kg N/feddan as a mineral form (min.),
120 kg N/feddan as organic form (org.), 90 kg N/feddan min. + 30 kg N/feddan org., 60kg N/feddan min. + 60 kg
N/feddan org. and 30 kg N/feddan min. + 90 kg N/feddan org. on yield and its components of some maize
varieties i.e. S.C 3084, S.C.10 and T.W.C.351. The obtained results showed that the S.C 3084 significantly
surpassed the other hybrids in ear leaf area and chlorophyll SPAD-units, number of ears/plant, number of
grains/ear, ear weight, grain weight/ear and grain yield/feddan (one feddan = 4200 m2). It was noticed that the
maximum values of plant and ear height, ear leaf area, chlorophyll units, number ears/plant, 100-grain weight,
ear weight, grain yield/fed, grain protein content (GPC) and grain NPK uptake in both seasons were obtained
by application of 120 kg N/fed as a mineral form. Whereas, no significant difference was noticed between 90kg
N min.+30kg N org./fed and 120 kg N min/fed on most characters studied in both seasons. The interaction
between maize hybrids and nitrogen sources significantly affected ear leaf area, chlorophyll SPAD-units,
number of grains/ear and grain N uptake in the 2nd season only.
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