Numerous multi-micronutrient fertilizers (MMF) have been developed during recent years to address the micronutrient deficiencies in crops and their biofortification in edible parts to overcome the malnutrition and hidden-hunger. The present field study was undertaken to know the effect of MMF on yield, nutrient biofortification in eggplant and soil microbial enzymatic activities under diverse fertility scenarios. Recommended dose of fertilizers (RDF) treatments (control, 75% and 100%) were applied in main-plots, and MMF levels (control, 0.5, 0.75 and 1.0 kg ha⁻¹) in sub-plots under split-plot design. Growth and yield of eggplant increased significantly with increasing levels of RDF. Similar trends were observed in available soil nutrient content and microbial activities. Likewise, 1.0 kg MMF ha⁻¹ increased growth and yield, and 0.75 kg MMF ha⁻¹ was also found at par with the highest dose. GGE biplot analysis revealed that the application of 0.75 or 1.0 kg ha⁻¹ MMF as foliar spray along with RDF is necessary to enhance micronutrient concentration in fruits. However, in shoot and leaves, higher levels of MMF improves nutrient content even without macronutrient application. Further, dehydrogenase activities and microbial biomass carbon was recorded significantly higher under 1.0 kg MMF ha⁻¹. Whereas, alkaline and acid phosphatases and urease activities were higher with 0.75 kg MMF ha⁻¹. Combined application of MMF (either 0.75 or 1.0 kg ha⁻¹) and RDF enhances yield (18.3–21.7%) and micronutrient concentration in eggplant fruits significantly, besides improving soil biological health.

近年来，人们开发了许多多微量营养素肥料 (MMF)，以解决作物中微量营养素缺乏及其可食用部分的生物强化，以克服营养不良和隐性饥饿。本田间研究旨在了解 MMF 在不同肥力情况下对茄子产量、营养生物强化和土壤微生物酶活性的影响。推荐剂量的肥料 (RDF) 处理（对照，75% 和 100%）用于主地块，而 MMF 水平（对照，0.5、0.75 和 1.0 kg ha ^-1）在分块地设计下的子地块中。随着RDF水平的增加，茄子的生长和产量显着增加。在可用土壤养分含量和微生物活动中观察到类似的趋势。同样，1.0 kg MMF ha ^-1增加了生长和产量，并且还发现0.75 kg MMF ha ^-1与最高剂量相当。GGE 双标分析显示，将 0.75 或 1.0 kg ha ^-1 MMF 与 RDF 一起作为叶面喷洒施用对于提高水果中的微量营养素浓度是必要的。然而，在芽和叶中，即使不施用大量营养素，较高水平的 MMF 也能提高营养含量。此外，在 1.0 kg MMF ha ^-1下，记录的脱氢酶活性和微生物生物量碳显着更高。然而，0.75 kg MMF ha ^{-1 的}碱性和酸性磷酸酶和脲酶活性更高。MMF 的组合应用（0.75 或 1.0 kg ha ^-1) 和 RDF 显着提高了茄子果实的产量 (18.3–21.7%) 和微量营养素浓度，此外还改善了土壤生物健康。