Effect of organic and mineral fertilizers on some specifications of Valencia orange juice

Abstract

This study was conducted during the years 2018 and 2019 on Valencia orange trees aged (40) years old and grafted on the root (), at Siano Research Station in the city of Jableh affiliated to the Agricultural Research Center in Lattakia Governorate, with the aim of studying the effect of organic and mineral fertilizers on fruit weight and some juice specifications, where used in the experiment cow, sheep and poultry residues and potassium humate acids, in addition to foliar spraying with some minor elements and ground mineral fertilization according to the recommended fertilizer formula, and each type was added separately and overlapping with the other type. The results of the study showed that the organic fertilizer mixing treatment outperformed the rest of the treatments, as the average of  fruit weight was( 253.33 g) under the influence of the organic fertilizer mixture from cow, sheep and poultry residues in treatment (F), which also gave the highest percentage of juice (136.78 g/fruit) and the highest content For fruits of soluble solids (13%) and the least significant difference in juice content of acidity at a rate of( 0.95%), while treatment (I) overpass  in fruits content of vitamin C at a rate of (52.27 mg/100 ml) juice in the treatment of a mixture of organic fertilizers with potassium humate. We conclude that All the additions were positive to improve the studied variables compared to not adding any type of fertilizer, but the benefit differed from one treatment to another, and in our experiment we applied  several options of fertilisers that the least expensive and environmentally friendly , that increase the product's ability to export at a competitive price.