Effect of Foliar Spraying with the Organic Fertilizer (Olego) and Seaweed Extract on Vegetative Growth, and Fruit Quality of Olive Trees (Khodiri variety)

Abstract

The study was conducted in the Bakssa region of Lattakia Governorate, during the
 2024 season on 45-year-old "Khodiri" olive trees. The aim of studying the effect of foliar spraying with the organic fertilizer (Olego) as a source of humic acid and the seaweed extract (Amino Max), either individually or in combination, on vegetative growth indicators and fruit quality of olive trees. The experiment included 9 treatments, each with three replicates. Using the following concentrations: Olego(0,1.5,2 cm³/L), AminoMax(0,2,3 cm³/L). Spraying was carried out at four times (bud swelling, full bloom, fruit set, and during fruit enlargement stage).

The statistical analysis results showed a significant increase in all studied indicators when we use organic fertilizer (Olego) as a source of humic acid and the seaweed extract (Amino Max) together. Treatments T9(Olego 2cm³/L+ AminoMax 3cm³/L), T8
(Olego 2cm³/L+ AminoMax 2cm³/L), and T7(Olego 1.5cm³/L+ AminoMax 3cm³/L) showed significant superiority in average leaf area (14.83cm², 14.19cm², 14.11cm²) respectively. Treatment T9 significantly excelled in total chlorophyll content in the leaves(84.62 SPAD), annual shoot length (25.16cm), fruit set percentage(6.69%), fruit weight(2.720g), and fruit volume(2.710cm³). While control treatment recorded the lowest values in all studied indicators.