Influence of fertilizer rates and growth stimulants on yield of sweet pepper variety dar Tashkenta

¹ Karshi State University, Karshi, Uzbekistan
² Bukhara State University, Bukhara, Uzbekistan
³ Scientific Research Institute of Vegetable Crops and Potatoes, Tashkent, Uzbekistan

^* Corresponding author: otabek90u@gmail.com

Abstract

This study investigated the effects of various fertilizer regimes and the application of a growth stimulant on the growth, development, and yield of the sweet pepper ( Capsicum annuum L.) variety Dar of Tashkent under field conditions during 2022–2024. The experimental design included six treatment variants: organic manure (20 t/ha), mineral fertilizers (N200P160K100 kg/ha), their combination, and the additional application of gibberellin (0.6–0.7 g per 10 L of water) during flowering. Key indicators assessed were seedling survival, vegetation period, plant height, leaf area, bush biomass, fruit weight, and both total and marketable yields. The results demonstrated that the highest plant survival (96.4%), tallest plants (86 cm), and largest leaf area (0.71 m²) were achieved in the variant with combined organomineral fertilization and gibberellin treatment. The vegetation period was extended by 3–4 days with organomineral fertilizers and by an additional 2–4 days with gibberellin. This combined treatment also produced the highest total yield (35.3 t/ha) and marketable yield (34.7 t/ha or 98.3%), significantly surpassing the control and single-fertilizer variants. The increased average fruit weight (115 g) and higher bush biomass confirmed enhanced productivity and physiological vigor. The findings suggest that integrating organic and mineral fertilization with gibberellin application is an effective agronomic strategy to improve sweet pepper performance. The results have practical implications for sustainable vegetable production and optimized nutrient management under field conditions. Statistical significance was established at EKF₀.₅ = 1.9–2.6.