The present study was carried on fruitful trees and budded transplants of Washington navel orange cv. during two successive seasons throughout 2008, 2009 and 2010 years. Two experiments were included dealing with: a- effect of some bio & organic nutritive compounds on fruitful trees (experiment,1) and b- effect of some citrus rootstocks on young budded transplants (experiment,II).
In the first experiment foliar spray with the following Biomagic, Hammer and peptone treatments (as bio and organic nutritive compounds) : 1- foliar spray with Biomagic 7.5g/L , 2- foliar spray with peptone 0.5g/L, 3- foliar spray with Hammer 1.5g/L, 4- soil drench application with Hammer 1.5g/L, 5- Biomagic foliar spray(7.5g/L) + Hammer soil drench (1.5g/L) and 6- Peptone foliar spray (0.5g/L )+ Hammer soil drench (1.5g/L), besides tap water foliar spray as control were investigated regarding their effect on vegetative growth , fruiting and nutritional status measurements. Data obtained revealed that all investigated treatments increased growth parameters (number, length, thickness of developed shoots, number of leaves/each and leaf area),as well as fruit percentage of (set, retention & drop), yield/tree and fruit physical & chemical properties were also improved. Moreover, leaf photosynthetic pigments (chlorophyll, A, B and carotenes) and nutritional status (leaf N, P, K, Ca, Mg, Fe, Mn and Zn) were also positively responded. However, Biomagic 7.5g/L foliar spray + Hammer 1.5g/L soil drench treatment was statistically the superior.
Nevertheless, in the second experiment all investigated parameters (success% of grafting, scion growth, leaf chemical constituents (chlorophyll, A& B and carotenes and N, P, K, Ca, Mg, Fe, Mn , Zn contents of scion, besides some anatomical features of union zone showed an obvious response to the three citrus rootstocks used (sour orange ,Volkamer lemon and Balady lime). However, such response was relatively varied from one measurable parameter to another. Besides, Volkamer lemon exceeded two other rootstocks in most cases.
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