Two field experiments were carried out during 2002 and 2003 growing
seasons at the Experimental Farm of the Faculty of Agricultural. AI-Azhar University,
Assuit Governorate, Egypt, to Study the effect of nitrogen fertilizers (90, 120 and 150
Kg N/fed.) and potassium fertilizer rates (zero, 24 and 48 Kg K20 N/fed.) on yield and
yield components of maize hybrids S.C.10 and T.w.C. 310. The most important results could be summarized as follows: 1-Each increase in nitrogen level up to 150 kg N/fed. and potassium fertilizer up to 48
Kg K20 /fed. resulted in significant increases in ear length, ear diameter, number of
rows per ear. 100-grain weight, shelling percentage and grain yield per feddan in
both seasons. 2- The interaction between maize hybrids, nitrogen fertilizer levels and potassium
fertilizer levels had a significant effect on grain yield per feddan in both seasons. 3- In general, the highest grain yield/fed. (33.21 Ardab/fed) was obtained from S.C. 10
when received nitrogen and potassium at rates of 150 and 48 kg/fed, respectively.