الفهرس 
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Abstract
This investigation was carried out in 1996, 1997 and 1998 seasons on one-year old of Washington navel orange (WO), Valencia orange (VO) and Balady mandarin (BM) seedlings budded on five citrus rootstocks namely; Volkameriana (VM), Troyer citrange (TC), Rangpur lime (RL), Cleopatra mandarin (CM) and Sour orange (SO) grown at the Experimental Farm of Sakha Agricultural Research Station, Kafr ElSheikh, Egypt. The experimental seedl ings were transplanted in the open filed (September, 1995) at 5x5 meters in a complete randomized block design with three seedlings plot replicated three time for a total of nine seedlings
per each tested rootstock budded with each scion variety. The purpose of this study as a part of long term research program was to evaluate and compare four of citrus rootstocks (VM, TC, RL and CM) with (SO) as a main rootstock for most citrus varieties in Egypt and other Mediterranean countries to find a potential substitute for sour .orange (SO) rootstock.
The evaluation and comparison included results and discussions on the following headlines:
1- Vegetative growth characteristics.
2- Root system, its density and distribution.
3- Uptake of macro and micro-nutrients.
4- Changes of some organic substances in leaves as indicators to some environmental stresses.
5- Quantitative description of the tree vigour after removing a tree samples in the end of the third growing season (November, 1998).