Contrasting potassium responses of growth, magnesium status and steviol glycoside traits in Stevia rebaudiana
This study reveals that while intermediate potassium levels optimize root expansion and biomass in *Stevia rebaudiana*, excessive potassium beyond this range fails to sustain total steviol glycoside productivity, exacerbates magnesium deficiency, and alters glycoside composition, indicating that these traits require distinct and coordinated nutritional management.