The main target of this experiment is to study the performance of Washington navel and Balady mandarin budded on Sour orange and Volkamer lemon or on Sour orange (interstock) budded on Volkamer lemon under two soil types (clay and calcareous).
The highest values of most measurements particularly vegetative growth; nutritional status and biochemical constituents for both citrus scions were in closed relationship to those transplants of both Washington Navel orange and Balady mandarin budded on Volkamer lemon rootstock and grown in clay soil during both experimental seasons. The superiority of such combination (budded transplants of both citrus scions on Volkamer lemon grown in clay soil) was significant as compared to other investigated combinations during both seasons of study.
On the contrary, the least values of most growth measurements were markedly related to the budded transplants of two citrus scions on the Sour orange interstock on Volkamer lemon grown in calcareous soil. The inferiority of such combinations was true during both seasons, irrespective of citrus scion.
Anatomical examinations of union zone of all investigated treatments proved the success of union process between two citrus scions (Washington navel orange & Balady mandarin) from one hand and any of the 3 rootstocks from the other. Microscopic examination of union zone between Sour orange interstock and Volkamer lemon rootstock showed also wider parenchymatous vacuoles and necrotic tissues, besides narrower area of different union zone tissues, particularly secondary cortex were presented which gave a logic explanation for the depressive influence of Sour orange interstock on most growth parameters. However, the union process took place successfully.
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