The present study was conducted on fruitfull Washington navel orange trees grown in a private farm located at zayed district, Minufiya governorate during 2009 & 2010 seasons to investigate the influence of some bio & organic substances as addition nutritive fertilizers i.e. Algae extract, putrescin and Hammer (Humic source) applied each slowly to another (Foliar & soil drench) besides water sprayed as control. Vegetative growth, yield, fruit quality and leaf nutrient content parameters were recorded.
The obtained results showed that, spraying Algae extract at 2% was statistically the most effective superior, whereas the greatest number of shoots per one meter limb, average shoot length and thickness, number of leaves per shoot and leaf area were obtained. Meanwhile, yield (kg) and number of fruits/tree were significantly improved by spraying Algae extract at 2% as well as Hammer soil drench at 100 cm/L water. Also, all investigated treatments with different nutritive bio & organic substance increased significantly T.S.S.%, total sugars %, TSS/acid ratio and ascorbic acid (V.C). In addition, all treatments under study increase in all leaf macro elements content (N,P,K,Ca and Mg%). Generally, spraying with Alage extract at 2% treatment was statistically the superior all evaluated parameters under study dealing with vegetative growth, fruiting measurements, fruit quality (either physical and chemical properties) and nutritional statues (leaf N,P,K, Ca and Mg%) content.