This Michigan State University Extension article addresses zinc (Zn) and manganese (Mn) deficiencies in sensitive field crops, explicitly including corn (for Zn) and soybean (for Mn). Soils with pH ≥7.0 are more vulnerable to both Zn and Mn deficiency. Zinc deficiency in corn appears as yellow striping of leaves; in dry beans, light green to yellow interveinal areas near leaf tips/edges in severe cases. Manganese deficiency causes yellow or olive-green foliage and reduced leaf size, and looks generally similar to zinc deficiency. Corn is listed among crops with a high response to zinc fertilizer (along with dry edible beans, onions, snap beans, sorghum, spinach, and sweet corn); soybean is listed among crops with a high response to manganese fertilizer (along with cucumbers, dry beans, lettuce, oats, onions, peas, potatoes, radishes, snap beans, sorghum, spinach, sudangrass, sugarbeets, sweet corn, table beets, and wheat). Management: both deficiencies can be corrected by applying an appropriate starter fertilizer near the seed at planting, or by foliar application once deficiency symptoms appear. Diagnosis: soil testing (specific Zn or Mn tests, $4 each or $7 for a combined sticker at MSU's lab) can determine whether Zn or Mn is needed; plant tissue analysis ($24 for field/vegetable crops) covering N, P, K, Ca, Mg, Zn, Mn, Cu, Fe, B, S, Na, and Al can also confirm sufficiency. The article does not provide specific application rates or soil-test critical thresholds, instead directing readers to MSU's "Secondary and Micronutrients for Vegetables and Field Crops" bulletin and a related "Micronutrient decisions for field crops" article for further detail.