Samer Kiwan*(1) Nadim Khalil(2) and Bayan Muzher(3)
(1). Sweida Agriculture Research Center, General Commission for Agriculture Scientific Research (GCSAR), Damascus, Syria.
(2). Soil Sciences Department, Faculty of Agriulture, Tishreen University, Latakia, Syria.
(*Corresponding author: firstname.lastname@example.org).
Received: 16/12/2017 Accepted: 06/07/2018
The study was carried out in apple orchard and at the laboratories of Agricultural Scientific Research Center, and Pome and Grapevine Division in Sweida (GCSAR), Syria, during the growing seasons of 2015 and 2016 to study the effect of organic residues, and boron and zinc addition on some soil characters, fruit set ratio and some fruits qualitative traits in Starking delicious apple cultivar in Sweida. The results revealed a significant decrease in soil-pH. And an increase in organic matter content compared with other treatments. A significant increase was observed in boron and zinc contents with the addition of organic residues and foliar spray application of boron and zinc (0.95 and 1.805 mg/kg, respectively), compared to control (0.505 and 0.926 mg/kg, respectively). The results revealed a significant increase in the rate of fruitlets in organic residues and foliar spray of boron and zinc together (38.18 %) compared with control (13.93%), while a significant increase was noticed in fruit weight in foliar spray of boron and foliar spray of zinc (236.8 g and 220.6 g, respectively), compared with control (187.9 g). The results revealed a significant increase in fruit firmness in organic manure and foliar spray of boron and zinc (8.087 kg/cm 2), and total soluble solids (15.22%) compared with other treatments. On the other hand, organic residues with foliar spray application of boron and organic residues with foliar spray of boron and zinc significantly achieved the highest value in total sugars (13.17% and 13.93 %, respectively) compared to the control (11.03%), while the results showed a significant increase in titratable acidity in the control (0.30%) compared to the other treatments. Consequently, the result showed that the addition of these fertilizers improves some soil characteristic, rate of fruitlets and some of the quantitative and qualitative traits of apple fruits.
Keywords: Apple, Foliar spray, Fruit set, Organic manure, Boron, Zinc.
Full paper in Arabic: PDF