The present study was conducted on fruitful Washington navel orange trees grown at a private orchard during 2009 & 2010 seasons to investigate the influence of some bio & mineral compounds i.e., Nofatrein and Biomagic foliar spray in different combinations with the N, P, K fertilizers on growth, productivity, fruit quality and nutritional status of Washington navel orange trees. All investigated nine treatments improved all evaluated parameters dealing with 1- growth parameters (No. of shoots / one meter limb, shoot length & thickness, No. of leaves per shoot and leaf area) 2- Fruiting measurements ( fruit set % & fruits retention and yield ), 3- Fruit quality either physical properties (fruit weight , dimensions , shape index , juice volume and peel thickness ) or chemical properties (juice TSS %, acidity %, TSS /acid ratio , total sugars and Vitamin C ), as well as the nutritional status (leaf N, P, K, Ca , Mg , Fe , Mn and Zn). However, the beneficial effect varied greatly from one investigated treatment to anther. Anyhow, Biomagic + (NH4)2SO4 + K2SO4 at 1% + P2O5 at 100ppm treatment was statistically the superior, descendingly followed by Nofatrien + (NH4)2SO4 at 1% + K2SO4 at 1% + P2O5 at 100ppm treatment. However, Control (water spray) treatment had the least efficiency. |
