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Nutrient Benefits


High Mn levels can reduce the availability of:

  • Iron


  • Manganese stimulates Potassium uptake


  • Chlorophyll production
  • Photosynthesis (water split)
  • N and carbohydrate metabolism
  • Oxidation reduction
  • Enzyme activity
  • Combines with Cu, Fe, and Zn to aid in plant growth processes

Deficiency Symptoms

  • Small grains can show a longitudinal striping
  • “Grey fleck” in oats
  • Chlorosis in fruits (more evident on the shady side of the tree)
  • Chlorosis of recently matured leaves with no reduction in leaf size
  • Less pronounced mottling in some broad leaf plants

Factors Affecting Availability

  • High pH soils
  • Limed soils
  • Light, sandy soils
  • Soils low in K
  • Soils low in organic matter
  • Soils high in Cu, Fe, and Zn
  • Cold, wet periods
  • Soils that have evolved from parent materials low in Mn

Sensitive Crops

  • Citrus, pome fruit, stone fruit, vines, strawberries, tomatoes, potatoes, pulses, vegetables, cereals (especially oats), sorghum


The following OMEX products can assist with addressing and correcting Manganese deficiency:

Visual Guide