Thesis (M.Sc.) - Cairo University - Faculty of Agriculture - Department of Pomology

The present study was conducted in the greenhouse of the nursery of Horticulture Research Institute, Giza, Egypt on Sour orange (Citrus aurantium L.) and Volkamer lemon (Citrus volkameriana) rootstocks seedlings during the growing season of 2011 and 2012. The study aimed to assess the positive influence of using phosphorus, active dry yeast, algae(diatoms) and combinations between them on improving the growth and leaf mineral content " N, P and K" of those rootstocks. The obtained results showed an improvement in the vegetative growth characteristics. Moreover, transplants treated with combination between active dry yeast, algae and phosphorus showed the highest significant performance of most growth parameters 2stem length, stem diameter, dry weight of roots, dry weight of leaves and leaf area3. Leaves nitrogen, phosphorus and potassium content increased significantly with the addition of combination between active dry yeast, algae and phosphorus. Therefore, it is recommended to use the combination between active dry yeast, algae and phosphorus in order to produce transplants with good vegetative characteristics and to shorten the time the seedling needs to be fit for grafting

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