Vol. 9, Issue 4, Part I (2025)

This study investigated the effect of humic acid, calcium oxide, and certain plant growth regulators on fig trees of the "Black Diyala" cultivar. The experiment was conducted during the 2024 growing season in a private orchard in the Al-Mahaweel district, Babylon Governorate. Four levels of humic acid and calcium oxide were added to the soil at concentrations: (0, humic acid at 10 mL/L, calcium oxide at 5 mL.L-1, humic acid 10 mL/L + calcium oxide 5 mL/L). In addition, foliar sprays of the growth regulators NAA and GA₃ were applied at concentrations (0, 75 mg.L-1 Naphthalene Acetic Acid, 100 mg.L-1 Gibberellic Acid). The treatments and their interactions were evaluated for their influence on various vegetative and fruit characteristics of the fig trees. The factorial experiment was executed in a randomized complete block design (RCBD) (4×3) with three replicates. The results revealed that both the individual and combined applications of the treatments led to significant increases in nitrogen, phosphorus, potassium content, chlorophyll index, vitamin C, total soluble solids (TSS), fruit moisture, and dry matter percentage. The treatment A4B3 recorded the highest values for nitrogen (3.27%), phosphorus (0.435%), potassium (1.903%), chlorophyll content (70.17 Spad), vitamin C (7.269 mg/100g juice), and TSS (18.96%). Meanwhile, the treatment A2B3 yielded the highest fruit moisture content (78.54%) and dry matter percentage in fruits (21.46%).