الفهرس 
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Abstract
The present study was conducted at Menpal Village, Mattay District, Minia governorate, Egypt during the two seasons of 2017 and 2018 to evaluate the effect of two types of biofertilizers (Minia azotine and Nitrobine) plus control and nitrogen fertilization levels (20, 40, 60, 80 and 100 kg/fed.) as well as their interactions on the vegetative growth traits and yield and its components of maize (Zea mays L.) yellow single cross hybrid (Pioneer 999).
The obtained results could be summarized as follow:
I-Effect of biofertilization
I-A- Vegetative growth parameters:
All vegetative growth parameters of maize [plant height (cm), stem diameter (cm), leaf area (dm2) and ear height (cm] were increased due to application of biofertilizers in both seasons. In most cases, the highest values of the abovementioned aspects were achieved with Minia azotine.
I-B- Yield and its components:
All yield and its components traits of maize (ear length and diameter, number of rows/ear, number of grains/row and grain yield) were increased due to applying plants with biofertilizers in both seasons. Minia azotine biofertilizer was the best for the abovementioned traits.
II- Effect of mineral nitrogen treatments
II-A- Vegetative growth parameters:
Mineral nitrogen levels significantly increased the abovementioned traits of vegetative growth facing 20 kg/fed. in both seasons. In most cases, the treatment of 100 kg/fed. was more suitable in this concern.
II-B- Yield and its components:
Mineral nitrogen fertilization levels significantly increased all abovementioned yield traits comparing with the low level (20 kg N/fed.) in both seasons. In most cases, the treatment of 100 kg N/fed. was more effective in most parameters, however, the treatment of 80 kg N/fed. was superior to other nitrogen treatments in grain yield (ard./fed.).
III-Effect of the interaction treatments
III-A- Vegetative growth parameters:
The interaction between biofertilizers types and mineral nitrogen levels treatments was not significant for all vegetative growth parameters during both seasons. However, in most cases, spraying Minia azotein with mineral nitrogen at 80 or 100 kg/fed. produced the highest values in this concern.