<![CDATA[Edamame (Glycine max (L.) Merrill) is a high-value economic crop. However, its productivity on marginal soils such as Ultisols remains limited due to low soil fertility. This study aimed to evaluate the effectiveness of single, compound, and micronutrient inorganic fertilizer combinations on the agronomic performance and pod yield of edamame in Ultisol. The experiment was arranged in a Randomized Complete Block Design (RCBD) with three replications and eight fertilization treatments, which included: a control (without inorganic fertilizer), standard single fertilizers (Urea, SP-36, KCl), compound fertilizer (NPK), and their combinations with foliar micronutrient fertilizers. The results showed that all fertilization treatments consistently and significantly increased the number of branches, leaf area, flowering rate, plant fresh weight, and filled pod weight compared to the control. The highest increase in filled pod weight per plant was achieved using the single fertilizer treatment (100 kg/ha Urea + 150 kg/ha SP-36 + 100 kg/ha KCl), with an increase of 138.1% (101.37 g), followed by increases in leaf area and plant fresh weight by 115.5% and 100.7%, respectively. Comparative analysis indicated no significant differences among the various fertilization combinations (P1–P7). Correlation analysis demonstrated that pod yield was positively correlated with canopy expansion (leaf area and number of branches) and biomass accumulation, rather than with parameters such as plant height. In conclusion, both single and compound inorganic fertilization combinations demonstrate equivalent effectiveness in optimizing edamame yield components in Ultisols. Cultivation strategies are recommended to utilize cost-efficient base formulations without the necessity of complex micronutrient additions. ]]>
