The present study was conducted on fruitful Washington navel orange trees grown at Experimental Station of Faculty of Agriculture, Benha Uni. during 2009 & 2010 seasons to investigate the influence of some bio & organic substances as additional nutritive fertilizers i.e., Biomagic, peptone and Hammer (humic source) applied either each solely or combined to another (foliar &/or soil drench), besides water spray as control. All investigated six 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 ) and 4- nutritional status (leaf N, P ,K , Ca and Mg %) . However, the beneficial effect varied greatly from one investigated treatment to another. Anyhow, Biomagic 7.5g/L foliar spray + Hammer 1.5g/L soil drench (6th treatment) was statistically the superior, descendingly followed by foliar spray with Biomagic solely 7.5g/L and/or peptone 0.5g/L foliar spray +Hammer 1.5g/L soil drench . However, Hammer 1.5g/L applied solely either foliar or soil drench had the least efficiency, especially foliar application. |
