Effect of organic and mineral fertilization on the productivity of Valencia oranges, the concentration of elements in leaves, leaf area and juice content of nitrates

Abstract

This study was conducted during the 2018 and 2019 seasons on Valencia orange trees aged (40) years at Siano Research Station in the city of Jableh affiliated to the Agricultural Research Center in Lattakia Governorate, the aim of studying is  the effect of organic fertilizers on the average tree productivity, leaf nutrient content, the area of the leaf surface and the juice content of nitrates. The experiment included two types of fertilizers within eleven treatments, which are organic fertilizers (cow, sheep and poultry residues and potassium humate), and mineral fertilizers (foliar spraying with some micro-elements in addition to the recommended fertilizer formula) individually on the one hand and interaction between them on the other.