Two field experiments were conducted at the Experimental Farm in Etai El-Baroud Agricultural Research Station, El-Beheira Governorate, Egypt on yield, yield components and quality of maize plant grown on 2019 and 2020 summer seasons, to study the effect of three preceding crops {Wheat cv. (Sakha 94), Sugar beet cv. (Careem) and Berseem cv. (Meskawy)} and five fertilizer treatments of {mineral (NPK) and biofertilizers (Mycorrhiza + Microben + Potassiummag ) as follow: {100% NPK (F1), 75% NPK + biofertilizers (F2), 50% NPK + biofertilizers (F3), 25% NPK + biofertilizers (F4) and biofertilizers only (F5)}.
        The results revealed that berseem was the best preceding crop. Which gave the highest values for yield, yield components and quality. Most of the studied traits of maize did not reach the 5% level of significance between maize grown after berseem and maize grown after sugar beet.  While planting maize after wheat recorded the lowest values.
         Fertilizer treatments were significantly on all maize traits. (F2) gave the highest values for yield and its components, while (F5) gave the lowest values. Meanwhile, no significant differences were found between fertilizer systems (F1, F2 and F3) for plant height, grain weight/ear and biological yield/fed. While F5 and F4 recorded the highest quality traits. 
        The interaction had a significant effect on most studied characters in the two growing seasons. Grown maize after berseem with (F2) fertilizer resulted in the highest values, whereas grown maize after wheat with (F5) treatment recorded the lowest values on yield and its components, the interaction did not reach the 5% level of significance between maize grown after berseem and maize grown after sugar beet under fertilizer treatments (F1, F2 and F3) for ear height, grain weight/ear and biological yield/fed, while interaction did not reach the 5% level of significance between maize grown after berseem with fertilizer treatments (F1 and F3) for grain weight/ear and grain yield/fed in both seasons.