الفهرس 
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Abstract
This study was conducted during three consecutive seasons of 2009, 2010 and 2011 on mature grafted Taimour mango trees grown in a private mango orchard located at Gerga district, Sohag Governorate.
The merit of this investigation was examining the effect of different proportions of inorganic and organic fertilization as well as application of EM on some vegetative growth characters, leaf chemical composition, fruit retention %, yield as well as physical and chemical characteristics of Taimour mango fruits. Selecting the best combination of N management that responsible for achieving the highest yield and improving fruit quality characteristics IS considered another target.
The selected Taimour mango trees were subjected to the normal horticultural practices that already applied in commercial orchards except those dealing with inorganic and organic N fertilization as well as application of EM or any biofertilizers.
The experiment included fifteen treatments from two factors (A& B). The first factor (A) evolved the following five levels from inorganic and organic fertilizers:-
al) Application of the suitable N (IOOOg/ tree/ season) as 100 % inorganic N (4855 g ammonium sulphate/ tree/ season).
a2) Application of the suitable N as 75 % inorganic N (3642 g ammonium sulphate/ tree/ season) + 25 % organic N (100 kg F.Y.M/ tree/ season).
a3) Application of the suitable N as 50 % inorganic N (2428 g ammonium sulphate/ tree/ season) + 50 % organic N (200 kg F.Y.M/ tree/ season).
a4) Application of the suitable N as 25 % inorganic N (1214 g ammonium sulphate/ tree/ season) + 75 % organic N (300 kg F.Y.M/ tree/ season).
as) Application of the suitable N as 100 % organic N (400 kg F.Y.MI tree/ season).
While, the second factor (B) comprised from three levels of Effective microorganisms (EM1) namely bl) 0.0 mll tree/ season, b2) 400 ml/ tree/ season and b3) 800 mll tree/ season. Each treatment was replicated three times one tree per each. Inorganic N source namely ammonium sulphate (20.6 % N) was splitted into four equal batches and added at the first week of Feb; March; April and May. Organic N form i.e. Farmyard manure (0.25 % N) was added once at the first week of January.
Effective microorganisms applied via soil was divided into four equal batches and added at the same times of inorganic N applications.
Completely randomized block designed in split plot arrangement was adopted. The five inorganic and organic fertilization treatments and the three levels of E.M. occupied the main and subplots, respectively.
The following measurements were recorded during the three seasons:
1- The leaf area in the spring growth cycle (cm2).