Improving Fruit Quality and Yield in Daisy Mandarin Cultivar by Foliar Application of Manganese and Iron

In a study at Guru Kashi University, Talwandi Sabo, Punjab, evaluated the effects of foliar-applied manganese (Mn) and iron (Fe) on the Daisy mandarin cultivar. Manganese sulphate (0.1%, 0.2%, 0.3%) and ferrous sulphate (0.1%, 0.2%, 0.3%) were applied individually and in combination, using a Randomized Block Design with sixteen treatments, four replications, and sixty-four treatment combinations. The combination of 0.3% MnSO₄ + 0.2% FeSO₄ significantly improved fruit length (138.0 mm), juice content (39.18%), vitamin C (39.97 mg/100g), and fruit firmness (14.9 kg/cm²) compared to the control. The highest TSS (12.75 °Brix) was observed with 0.2% MnSO₄, however, 0.3% MnSO₄ + 0.3% FeSO₄ maximized fruit weight (156.87 g), fruit number (480.5), and yield (75.37 kg/plant).