Aeroponic Growth System and Soil-Based Cultivation: Insights into Mineral Nutrients, Antioxidant Molecules and Antioxidant Activity in Edible Parts of Different Vegetables
In this study, the growth of tomatoes, basil, lettuce and courgette in aeroponic versus traditional soil-based cultivation revealed key differences in mineral nutrient content, antioxidant molecules, and antioxidant activity. The aeroponic system yielded comparable or higher concentrations of P (in basil), K (in lettuce and basil), Ca and Mg (in all species), Fe (in tomatoes), Mn (in basil, courgette and tomatoes), and Cu and Zn (in courgette). Aeroponic cultivation enhanced or maintained the antioxidant content, with the highest flavonoid levels in basil (75.84 mg QE g−1 DW), followed by lettuce (65.97 mg QE g−1 DW). Consistent with these findings, total antioxidant activity assays were highest in aeroponically grown basil (91.27 ARA%). However, responses varied by crop and maturity stage: DPPH radical-scavenging activity was greater in soil-grown lettuce (92.30 ARA%), while FRAP values were highest in basil in both aeroponic and soil-grown cultures (197.02 and 195.3 mg FeSO4 g−1 DW, respectively). However, the interspecific differences indicate that aeroponic systems cannot be applied uniformly; rather, each species could maximize productivity and quality under appropriate conditions. Overall, aeroponic cultivation proved to be a resource-efficient and sustainable alternative to conventional soil farming, providing comparable or superior nutritional quality and reducing water consumption.