EFFECT OF MIRACLE BIOFERTILIZER ON GROWTH AND YIELD OF ONION

A field study was conducted during the Rabi season of 2025-26 at two distinct locations under the Bangladesh Agricultural Research Institute (BARI)-the Soil Science Division in Gazipur and the On-Farm Research Division (OFRD) in Rangpur. The primary objective was to evaluate the efficacy of Miracle Biofertilizer (MB) as a sustainable supplement to chemical fertilizers (CF) for onion (Allium cepa L.) cultivation. The experiment utilized five treatments: T₁ (100% CF), T₂ (75% CF + MB), T₃ (50% CF + MB), T₄ (MB alone), and T₅ (control). Results indicated significant variations in growth and yield parameters across both sites. In Gazipur, the highest onion yield was recorded in T₂ treatment (17.11 t ha⁻¹), which was statistically similar to T1 treatment (16.51 t ha⁻¹). Similarly, in Rangpur, T₂ treatment produced the maximum yield of 12.68 t ha⁻¹, significantly outperforming the 100% CF treatment (11.37 t ha⁻¹). Growth attributes such as plant height and bulb dimensions followed a similar trend, with T2 consistently performing as well as or better than the full chemical dose. Notably, the T3 treatment (50% CF + MB) produced yields of 15.13 t ha⁻¹ in Gazipur and 10.57 t ha⁻¹ in Rangpur, suggesting that chemical inputs can be reduced by 50% with manageable yield impacts. The study concludes that integrating Miracle Biofertilizer with 75% of the recommended chemical fertilizer (T2) is the most effective strategy for maximizing onion productivity.