الفهرس 
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Abstract
This study was carried out during the two successive seasons of 2014 and 2015 on sixty 20-years old Zebda mango trees onto seedling rootstock. The trees were grown on a private mango orchard that was located at Kom Omboo city, Aswan Governorate, Egypt where the soil has a sandy texture. The uniform of vigour trees was planted at 7x7 meter apart
The experiment included the two factors, the first five nitrogen treatments as following:
1. Application of the recommended dose of nitrogen (RDN) of 1000 g N/tree/year (3.0 kg ammonium nitrate/tree/year) as mineral N form (F1).
2. Application of the RDN as 25% mineral, 50% organic and 25% bio (EM) fertilizers (F2).
3. Application of the RDN as 25% mineral, 25% organic and 50% bio (EM) fertilizers (F3).
4. Application of the RDN as 25% mineral, 50% organic and 25% bio (bio-mex) fertilizers (F4).
5. Application of the RDN as 25% mineral, 25% organic and 50% bio (bio-mex) fertilizers (F5).
The second, zinc sprays as follow:
1. Spraying the trees with distilled water (Z1).
2. Spraying the trees twice with zinc sulphate (ZnSO4) at 500 ppm (Z2).
3. Spraying the trees twice with zinc sulphate (ZnSO4) at 1000 ppm (Z3).
4. Spraying the trees twice with zinc sulphate (ZnSO4) at 1500 ppm (Z4).
Regular agricultural and horticultural practices which are used in the orchard including pruning, hoeing, P and K fertilization and irrigation with Nile water as well as pathogens, pests and weed control were carried out as usual. The following measurements were taken on the selected trees.
1- Shoot growth and leaf traits.
2- Measurements of plant pigments
3- Measurements of N, P and K contents of leaves
4- Yield and fruit quality.
The nearly some obtained results during both seasons could be summarized as follows
1- Vegetative growth:
Growth parameter were significantly affected by application of organic and bio-fertilization compared with using the recommended dose of nitrogen (RDN) via mineral N source alone. Such results indicated the application of the required N through using 25% of RDN as mineral-N along with using 25 or 50% as an organic form enriched with 50 or 25% as a bio-fertilizer as either effective microorganisms (EM) or bio-mex significantly increased such traits compared to using RDN only as