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
Ruffin-Tuff Crop Mix II
Micronutrient Soil
Ruffin-Tuff Manganese
Micronutrient Soil
Micro-Che Mn
Micronutrient Soil
Kinetic Manganese
Macronutrient Foliar
Macronutrient Foliar
ReLeaf Soybean
Macronutrient Foliar
42PHI Rhizo
Macronutrient Foliar

Nutrient Knowledge Guide

Download ATP’s Nutrient Knowledge Guide – Your All Inclusive Guide to Plant Nutrition, aimed to help you achieve optimum yield.

Related Articles