This University of Minnesota Extension bulletin (AG-FO-03813-D, revised 2020) covers soybean fertility, with micronutrient guidance concentrated in two sections. Iron Deficiency Chlorosis (IDC): occurs on soils with pH ≥ 7.4 (no true soil Fe shortage; uptake is blocked). No easy fix, but severity can be reduced by: 1) selecting tolerant varieties (chlorosis scores published by UMN and seed companies); 2) minimizing plant stress (avoid certain post-emergence herbicides, high-salt soils, deep cultivation, soil compaction, seedling disease, and carryover soil nitrate, which worsens IDC); 3) seed-applied EDDHA-Fe chelate (ortho-ortho form) at 1-3 lb active ingredient/acre, shown to increase yield; and 4) an oat companion crop seeded at 1.5 bu/acre and killed at 10-inch height, which reduces IDC in severely affected areas. Recommended practice for IDC-prone fields: plant a tolerant variety plus in-furrow EDDHA-Fe and/or an oat companion crop. Other micronutrients: Minnesota trials found no soybean yield response to magnesium, zinc, or copper, so these are not recommended despite reported links between glyphosate-tolerant soybean and possible manganese/micronutrient deficiencies. Boron: soybean has low tolerance to B; broadcast rates as low as 2 lb B/acre can cause toxicity, and research shows no yield benefit from B application, with high rates more likely to reduce yield. Manganese: no widespread Mn need demonstrated in Minnesota, but soybean may respond on soils with pH > 7.4 and DTPA soil Mn (0-6") ≤ 10 ppm; in these cases, 10 lb Mn broadcast/acre may be warranted. Foliar Mn has not been tested in Minnesota and should only be tried experimentally. On more acidic soils with low DTPA Mn, no consistent Mn benefit was found. Overall guidance: prioritize Fe management for IDC-prone fields; skip Mg/Zn/Cu/B fertilization; consider Mn only on high-pH, low-Mn-test soils.