A field experiment was carried out on 6-year-old Manfaloty pomegranate trees
grown in sandy soil at 3 × 5 m under drip irrigation system in Abo-Hamad Distrect, Sharkia
Governorate, Egypt, during the two successive seasons of 2015 and 2016. Thirty-three trees were
subjected to 11 mineral fertilization treatments with or without mycorrhiza or yeast extract. Control
trees fertigated by 100% mineral NPK without mycorrhiza or yeast extract addition. Other
combinations were 75, 50 and 25% mineral NPK with or without 30 g mycorrhiza or yeast extract.
The mineral fertilizer and died yeast applied by fertigation in ten doses during the season, while
mycorrhiza was applied to the soil in the wet region under the drippers at the first season (late of
February) in the two seasons. The obtained results showed that the highest yield (38.85 and 24.76
kg/tree), average fruit weight (462.70 and 462.10 g), fruit firmness (759.90 and 765.50 g/cm2), number
of grains/fruit (630.70 and 484.20 grain) and grains weight (227.70 and 213.50 g) were gained by trees
fertilized by 25 % mineral NPK + 30 g mycorrhiza/tree in the both seasons, respectively. The
produced fruits on trees of this treatment contained higher TSS/acid ratio and total anthocyanin
content. The trees fertilized by 75% mineral NPK + 30 g mycorrhiza / tree exhibited higher fruit
retention percentages (92.34 and 88.70%) in the two seasons, respectively without significant
differences between them in most cases. Leaves of trees fertigated by 100% mineral/tree (control)
contained the highest values of N, P, K, Ca and Mg in the both seasons. The results of this study
showed that it is possible to saving 50 - 75% of mineral fertilizers with obtaining higher yields
with better fruit quality by adding the mycorrhiza at 30 g/tree.