Abstract
A field study was conducted on sweet orange (cultivar “Red Blood”) orchard of a farmer at Shahbaz Garhi, Mardan to evaluate the effect of foliar spray of Zn, Mn and B on the fruit yield and leaf nutrient concentrations as well as to diagnose their critical levels. Zinc, Mn and B alone and in various combinations were applied as foliar spray in the form of sulfate salts and boric acid @ 0.4, 0.2 and 0.04 kg ha-1, respectively dissolved in 400 liters of water. Leaf samples were analyzed for different micronutrients and fruit yield was recorded. Foliar sprays of Zn, Mn and B significantly increased fruit yield. Leaf concentrations of Zn and Mn were also increased with the foliar spray of the respective micronutrients but leaf B was not significantly influenced by B spray. Critical levels of Zn, Mn and B in leaves were found to be 22, 25 and 29 mg kg-1, respectively. It may be concluded that the levels of leaf concentrations of Zn, Mn and B mentioned above serve as guide for the nutrient status of sweet orange trees. Trees require foliar application with the relevant micronutrient when its leaf concentration goes down the critical level.
Hafeez-ur-Rahman1, Izhar-ul-Haq2*. (2006) Diagnostic criteria of micronutrients for sweet orange, The Journal Soil & Environment , Volume 25, Issue 2.
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