Impact of Foliar Nutrient Application on Quality Attributes and Leaf Nutrient Composition in Kinnow Mandarin

The quality of Kinnow mandarins (Citrus reticulate Blanco) is significantly influenced by the application of micronutrients, which play a crucial role in enhancing fruit attributes. This study evaluated the effect of foliar applications of 1.5% zinc sulfate, 0.6% boric acid and 0.5% potassium sulfate on various quality parameters of Kinnow mandarins cultivated in North India. Key quality metrics analyzed included juice content, peel content, rag content, peel thickness, total soluble solids (TSS), acidity, ascorbic acid and the TSS/acid ratio. Foliar nutrient treatments resulted in an increase in juice content and a reduction in peel and rag content, thereby improving the edible portion of the fruit. Peel thickness was minimized, contributing to better consumer acceptance. Additionally, significant improvements were observed in biochemical parameters: TSS, acidity, ascorbic acid levels and the TSS/acid ratio, enhancing the overall flavor and nutritional profile of the fruit. The study also examined leaf nutrient status (N, P, K, Zn and B), confirming improved uptake and utilization of essential nutrients under the foliar treatments. These findings underscore the importance of precise micronutrient management for achieving superior fruit quality in Kinnow mandarins.