الفهرس 
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Abstract
This investigation was carried out during two successive seasons of 2004 and 2005on 8 year old picual olive trees grown at a private farm at Wady-El-Natroun region, El-Behara Governorate. All trees under taken in this investigation were similar in growth vigour, healthy, apparently free from disease and received the recommended amount of irrigation water using drip irrigation system. The annual fertilization program adopted was as recommended by Ministry of Agriculture i.e., 0.06 Cubic meters of dairy manure, 410 gm NH4NO3 + 600 gm super phosphate + 1.5 kg potassium sulphate /tree yearly added through drip irrigation system during January.
The main purpose was to investigate the response of such picual trees concerning their vegetative growth, flowering behavior, germination pollen grains viability, fruiting, yield (kg) /tree /year and oil content (%) as well as fruit characters and nutritional status to some nutritional treatments.
Since, four experiments were involved. The first included the response of picual olive trees to two nitrogen sources and their rates as soil application. Second dealing with the response of picual trees to nitrogen sources, application methods and their combinations, The third experiment for study the response of picual olive trees to two potassium sources, phosphorous, application methods and their combination. Fourth experiment for studying the response olive trees to NPK soil application and two concentrations of boron foliar spray treatments. Treatments of each experiment were arranged in complete randomized block design with 3 replications and two trees were devoted for each replicate.
Keywords: Olive, cultivars, fertilization, N, P, K, and B.