Ali Deeb(1) and Ammar Nbeaa*(1)
(1). Horticulture Department, Faculty of Agriculture, Tishreen University,latakia, Syria.
(*Corresponding author: Eng. Ammar Nbeaa. E-Mail: ammar.nbeaa1991@gmail.com).
Received: 15/02/2019 Accepted: 12/04/2019
Abstract
The study was carried out during 2017 and 2018 at Setkhiris village which belongs to the countryside of Latakia Governorate in citrus orchard containing (55) orange trees of Washington navel at the age of 15 years old and grafted on citrus Aurantium as root stock, to study the relationship between the distribution of the quarterly growth cycles on the productive surface and the quality of the fruits. The experiment was carried out as a factorial experiment with four experimental plots distributed on the four sides of the orchard (each side is considered as a plot) and (3) trees in each plot. Each tree represented one replication. The experiment includes two factors; the change in height and the quarterly growth cycles (Spring, summer and autumn). The results showed that autumn growth cycle in the third layer of the crown exceeded TSS (12.1%), total sugar content (10.23%) and fruit content of vitamin C (49.26 mg/100 ml Jiuce), while total acidity decreased according to the height of the fruit on the crown.
Key words: Citrus, Washington navel, Growth cycles, Crown layers.