Impact of Pruning, Foliar Spraying with Gibberellic Acid, and Chelated Iron in Leaves Nutrients Content of Fig Trees Cv. Black Diyala

Abstract

The research was conducted on fig trees, black diyala cultivar, at the age of (13) years, planted in one of the orchards affiliated with the General Directorate of Vocational Education / Vocational Section in Diwaniyah Mixed Agricultural Preparatory School / Al-Qadisiyah Governorate for the season 2022. 81 black fig trees were selected, homogeneous in size, height, and growing strength as much as possible. They are planted on dimensions (4 x 4) meters. to study the effect of pruning (0, 25, and 50%) and spraying with gibberellic acid (0, 30, and 60 mg.L−1) and chelated iron (0, 1, and 2 g.L−1) in the nutrient content of leaves of fig trees, Black Diyala cultivar. The experiment was designed according to a randomized complete block design (RCBD). The results showed that the levels of pruning and the concentrations of spraying gibberellic acid and chelated iron on the trees were positive in increasing the leaf content of the nutrients under study compared to the comparison treatment, whether it was single or combined. The treatments P2, G2 and F2 were characterized by giving them the best results, as they recorded 2.57, 2.35 and 2.26% for nitrogen, 0.244, 0.199 and 0.183% for phosphorus, 1.83, 1.66 and 1.60% for potassium, 1.007, 0.925 and 0.890% for calcium, 472.80, 391.00, and 359.95 mg.kg−1 dry matter, respectively.