Vol. 9, Issue 5, Part M (2025)

The present investigation was conducted to evaluate the effect of foliar-applied boron and sulphur on the vegetative growth of Calendula officinalis under a factorial randomized block design with three replications. Treatments included three levels each of boron (0%, 0.1%, 0.2%) and sulphur (0%, 0.1%, 0.2%). Observations on plant height, leaf area, and number of leaves were recorded at 30, 60, and 90 days after transplanting (DAT). While early-stage growth (30 and 60 DAT) showed non-significant differences in plant height, significant enhancements were observed at 90 DAT, particularly under combined application. The treatment B₁S₁ (0.1% boron + 0.1% sulphur) consistently recorded the highest values across all parameters and growth stages, indicating a synergistic effect. Notably, B₁S₁ produced the maximum plant height (28.21 cm), leaf area (60.79 cm²), and number of leaves per plant (197.10) at 90 DAT. These findings underscore the potential of moderate concentrations of foliar boron and sulphur in enhancing late-stage vegetative growth in calendula through improved leaf development and biomass accumulation.