Plant Nutrition

Manganese Nutrient Info

Manganese - Quick Facts

  • Manganese plays a vital role in photosynthesis by aiding in chlorophyll synthesis
  • 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
  • Similar to copper, manganese is important for immobilization of free oxygen radicals.
  • Manganese is very immobile in plants, with deficiency symptoms appearing first on younger leaves.
  • Form used by plants: Mn+2


Manganese - Role of Nutrient

  • Regulates the splitting of the water molecules during photosynthesis
  • Accelerates germination and early season seed development
  • Activates several enzymes
  • Increases the availability of P and Ca
  • Aids in chlorophyll synthesis
  • Heightens the concentration of valuable ingredients such as citric acid and vitamin C


Manganese - Nutrient in Soil

  • In acid soils, toxicity may occur. Signs may include chlorosis, early leaf abscission, reduced flower bud development, and internal bark necrosis.
  • Availability of Mn decreases as pH increases (at soil pH 6.3, Mn becomes insoluble).

Manganese - Deficiency Symptons

  • 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
  • Gramineae show chlorotic and necrotic strips
  • Acidification of soils with sulfur can correct manganese deficiency
  • Limited mobility of Mn 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

Manganese - Factors Affecting Deficiency

  • High soil pH (7.0 or above)
  • Soils that are high organic matter, cold wet soils, poorly drained soils, light sandy soils
  • Low levels of K can also interfere with effective uptake of Mn.
  • High soil levels of available copper (Cu), iron (Fe), or zinc (Zn) will reduce Mn uptake by plants.

R3 Agronomic Platform

R3 Lifecycle: Roots > Reproduce > Ripen

Roots – The vegetative stage looks to develop vigorous, healthy roots to maximize nutrient acquisition from the soil. The end result is a healthy root rhizosphere.

Reproduce – Supply the essential nutrients at reproduction to help the plant maximize pollen viability, flowering, pollination, seed set and fruit development.

Ripen – Late season nutrition is vital to optimize the nutrient density and quality of the crop.

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