Interactive Effects of Calcium Chloride and Borax Foliar Sprays on the Biochemical Quality of Guava (Psidium guajava L.)

Abstract

This study evaluated the impact of pre-harvest foliar applications of calcium chloride and borax alone and in combinations on critical biochemical parameters of guava (Psidium guajava L.) cv. L-49. Nine treatment groups included various concentrations of calcium chloride and borax, both individually and in combination, with untreated controls for comparison. Analysis focused on total soluble solids (TSS), titratable acidity, ascorbic acid content, reducing sugar, non-reducing sugar, and total sugar contents. Results demonstrated significant improvements in fruit biochemical quality with combined applications, particularly at higher concentrations. The combination of calcium chloride 0.2% with borax 0.1% significantly improved TSS, ascorbic acid, reducing, non-reducing, and total sugar contents, while also minimizing acidity. These improvements in fruit quality result from better nutrient uptake, stronger cell walls, and positive metabolic changes. These findings support the synergistic role of calcium and boron in improving not only yield but also the nutritional and organoleptic value of guava.