This study investigated the combined effects of arbuscular mycorrhiza fungi (AM) and foliar fertilizer (Growmore) application on potato tuber growth and yield to improve nutrient efficiency, crop productivity, and agricultural sustainability, conducted in May-September 2023 in Bantaeng, Indonesia. The two-factor factorial field experiment involved four doses of AM (control, 7.5, 15, and 22.5 g plant^-1) and three concentrations of foliar fertilizer application (2, 4, and 6 g L^-1), repeated three times. The results showed a significant interaction effect on the combination of AM application (15 g plant^-1) and foliar fertilizer (6 g L^-1), increasing stem diameter, number of leaves, tuber weight, and yield. The foliar fertilizer (4 g L^-1) affected the number of leaves, while AM (15 g plant^-1) increased tuber weight and yield. Phosphorus content analysis was highest when adding AM (15 g plant^-1) and foliar fertilizer (6 g L^-1). The highest protein appeared with AM (7.5 g plant^-1) and foliar fertilizer (6 g L^-1), and the maximum vitamin C emerged with AM (15 g plant^-1) and foliar fertilizer (4 g L^-1) applications. An integrated approach using AM (15 g plant^-1) and foliar fertilizer (4-6 g L^-1) proved effective in increasing potato productivity.

Keywords: Potato (S. tuberosum L.), mycorrhiza, mineral fertilizer, growth traits, potato tubers

Key findings: In potato (S. tuberosum L.) production, a significant increase occurred by using mycorrhiza and foliar application of mineral fertilizers.