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Abstract
This study was carried out during two successive seasons 2010-2011 and 2011 {u2013} 2012 on Washington Navel orange cultivar (Citrus Sinensis) budded on sour orange (Citrus aurantium, L.Osbeck) rootstocks grown in sandy soil under drip irrigation system in a private orchard located at El-Shrouk farm (72 km of Cairo-Alex. desert road), El-Giza Governorate, Egypt. The purpose of this study was to determine the optimum time of foliar application for Washington navel orange trees with pre- bloom foliar application with urea, putrescine, and full bloom foliar application with gibberellins (GA3), to improve nutritional status, growth characters, flower retention, fruit set and increase total yield. In addition to develop fruit quality and safety for competitiveness of citrus fruit products in local and international markets. The obtained results showed an improvement in the growth characters, yield, fruit quality, physical parameters and nutritional status with all foliar application treatments. In this respect, it can be suggested that, foliar spray with urea (100% N unit) and 15 Micromolar putrescine at the pre-bloom period ”4th week of December” and foliar spray with 30 ppm GA3, green algae extract ”Enteromorpha sp at 0.5%” and red algae extract ”Asparagopsis sp at 0.1%” at the full-bloom period ”1st week of April” may be suitable for attaining a balanced plant nutrient resulting in increasing plant growth, fruit quality and yield through improving plant nutritive status