Manganese has the power to impact many important processes including stomatal activity, photo assimilate movement, disease resistance and insect infestation, and overall plant growth and yield.

Quick Facts About Manganese

  • Manganese plays a vital role in photosynthesis by aiding in the splitting of the water molecule.
  • Manganese plays an essential role in enzyme maintenance.
  • Manganese influences the uptake and assimilation of other nutrients in the plant.
  • Manganese affects energy budget by regulating carbohydrate metabolism.
  • Reduction of nitrates in plants is only possible if sufficient Manganese is present.
  • Manganese is very immobile in plants, with deficiency symptoms appearing first on younger leaves.
  • Manganese can exist as 3 different valencies in the soil (Mn+2, Mn+3 and Mn+4) . The plant available form is Mn+2.

Role of Manganese in Plants

  • Regulates the splitting of the water molecules during photosynthesis.
  • Accelerates germination and early season seed development.
  • Activates several enzymes.
  • Increases the availability of Phosphorus and Calcium.
  • Aids in chlorophyll synthesis.
  • Heightens the concentration of valuable ingredients such as citric acid and vitamin C. 
  • Similar to Copper and Zinc, Manganese is importance for immobilization of free oxygen radicals.


Manganese Deficiencies:

Deficiency Symptoms

  • Chlorosis on mature foliage followed by chlorosis on young foliage.
  • Crops become yellowish to olive green, and foliage appears wilted.
  • Interveinal chlorosis developing in leaves.
  • Cereals show chlorotic and necrotic strips.
  • Acidification of soils with Sulphur can correct Manganese deficiency.
  • Limited mobility of Manganese in the plant.
  • The deficiency symptoms are especially characteristic in oats which are called: grey speck or early blight; here the plant exhibits dirty grey strips or spots on the base of the leaves.
  • The entire water balance is affected that will cause wilting of the plant.

Factors Affecting Deficiencies

  • High soil pH (7 .0 or above).
  • Soils that are high organic matter, cold wet soils, poorly drained soils, light sandy soils.
  • Forms of Nitrogen fertilizer can affect Manganese availability.
  • Low levels of Potassium can also interfere with effective uptake of Manganese.
  • High soil levels of available Copper (Cu), Iron (Fe), or Zinc(Zn) will reduce Manganese uptake by plants.
  • Under waterlogged conditions, Manganese becomes reduced (highly plant available) which can cause a reduction in Copper, Zinc and Iron Uptake.

Manganese Recommended Products

Product Type Details
PreCede Cereal
Seed Nutrition
Micro-Che Mn
Micronutrient Soil
Impel Manganese
Micronutrient Foliar
ReLeaf Canola
Macronutrient Foliar
ReLeaf Cereal
Macronutrient Foliar
ReLeaf OS
Macronutrient Foliar
ReLeaf Corn
Macronutrient Foliar
ReLeaf Soybean
Macronutrient Foliar
ReLeaf Rhizo
Macronutrient Foliar
42PHI Rhizo
Macronutrient Foliar
Laser CaB
Macronutrient Foliar
Laser KS
Macronutrient Foliar
Laser P
Macronutrient Foliar

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