Ali Deeb1*, Ali Alkhatib2, and Raeed Gaafar1

1 Department Of Horticulture, Faculty Of Agriculture, Tishreen University, Lattakia, Syria.
2 General Commission for Scientific Agricultural Research, Lattakia Research Center.
(*Corresponding author: Ali Deeb, Email: alikhalildip@gmail.com).

Received: 27/ 5/ 2024    Accepted: 25/ 8/ 2024

Abstract

The study was conducted during the year 2023 on Mediterranean tangerine trees (Mandarin baladi), grown at the Ciano Research Station of the General Commission for Scientific Agricultural Research. (Lattakia Research Center), in a field of 3,000 m2, at an altitude of about 125 m above sea level, with the aim of studying the effect of the rootstock and spraying with boron and zinc on some productive indicators of the trees of the studied cultivar. The study included three rootstocks, Troyer citrange, Citrumelo 4475 and Poncirus trifoliata (L. Raf), and spraying with boron, at a concentration of 200 ppm, and zinc at a concentration of 100 ppm, singly and mixed, this is on three dates (Two weeks before flowering, after fruit set, and one month after the second spray). The results confirmed the great role of the rootstock, as the rootstock Troyer Citrange outperformed the two rootstocks, Citromilo 4475 and the trifoliate orange, for all the studied indicators (percentage of set 21.63%, fruiting coefficient 8.57, tree production 93.64 kg/tree, and productivity 4.68 ton/donm). The rootstock, Citromilo 4475, outperformed the three-leaf orange rootstock, and with regard to foliar spraying treatments with two elements, Boron and zinc were observed to be superior to the treatment of spraying both elements together over the rest of the treatments for all the studied indicators. Also, the treatments spraying with boron and zinc individually outperformed the control treatment and without there being a significant difference between them with regard to the percentage of set and fruiting coefficient, and with the presence of a significant difference between them with regard to tree production and productivity in favor of the treatment. Spraying with the boron element. As for the mutual effect, the spraying treatment with boron and zinc together on the Troyer citrange rootstock was also the highest in value, (percentage of set 28.27%, fruiting coefficient 11.22, tree production 167.28 kg/tree, and productivity 8.36 ton/donm) and it outperformed the rest of the treatments and rootstocks.

Keywords: Mediterranean tangerine, rootstock, boron, zinc, productivity indicators.

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