Three hybrids of maize (SC-168, SC-176 and TWC-321) were the subject of a field experiment conducted at the El-Serw Agricultural Research Station, and four combinations of mineral and Nano-N fertilization (120 kg N/fed mineral as a control treatment, 50% N mineral + 50% N nano, 75% N mineral +25% N nano, and 50% N mineral + 100%N nano), on maize and soybean yields and its attributes as well as land use efficiency. The study applied in a split-plot design with three replications. The findings demonstrated that maize hybrids greatly impacted both seasons' yield and characteristics of both maize and soybean. Data revealed that SC-168 maize hybrid achieved the highest values for all characters except, plant height and LAI in both seasons, whereas soybean with SC-168 hybrids significantly increased seed yield and its attributes except, plant height compared with other hybrid in both seasons. Treatment of nitrogen fertilization 75% Mineral + 25% N Nano significantly increased all studied characters of both crops in both seasons. Results indicated that most characters of maize and soybean were significantly by the interaction between two factors under study, and maize SC-168 hybrid with 75% M + 25% N Nano gave the highest values for all yields and its attributes of maize hybrids and soybean in both seasons. Treatment of 75% M+ 25%N nano recorded the highest values for each of LER and RCC in both seasons. Results indicated that maize hybrids were the dominant crops whereas soybean was the dominated crop in both seasons.