Influence of Exogenous Plant Growth Regulators to the Growth and Yield Potential of Tomato (Solanum lycopersicon L.)

Abstract

The tomato is notable vegetable crop for its abundant vitamins, minerals, and antioxidants. The experiment was conducted during the rabi season of 2024–2025 at United University, Prayagraj, to assess the effects of plant growth regulators (PGRs) on tomato cultivar ‘NDT-1’. The randomized block design included 13 treatments: four concentrations (25, 50, 75, and 100 ppm) each of GA₃, auxins, and kinetin, plus a control, replicated thrice. Results showed that GA₃ at 75 ppm (T₃) was most effective, significantly reducing days to first flowering (39.54 days) and 50% flowering (40.58 days), while enhancing plant height (101.35 cm), primary branches (7.14), flower clusters (10.98), yield (2.68 kg/plant), and fruit quality (TSS 6.23 °Brix, ascorbic acid 26.58 mg/100 g, lycopene 6.23 mg/100 g). Kinetin at 25 ppm (T₉) and auxin at 100 ppm (T₈) also improved some parameters. These findings underscore the potential of GA₃ at 75 ppm for boosting tomato growth, yield, and quality under these conditions. Future work could explore synergistic PGR effects and integrated nutrient management for enhanced productivity.