Manganese (Mn)

  • Manganese is one of the 13 essential elements for plant growth, and is considered a micronutrient based on the concentration required for plant growth
  • principle form of uptake: ionic form (Mn2+)
  • amount required for healthy plant growth: 50 ppm, dry soil matter
  • manganese ions primarily move through the soil via diffusion
  • soil conditions related to deficiencies in manganese:
    • calcareous soils where manganese availability is low
    • poorly drained, high organic composition soil
    • strongly acidic sandy soil subjected to high rainfall
    • soils from low-manganese parent rock
  • acidic soil with excessive manganese can lead to iron deficiencies
  • isn’t known to interfere with the metabolism or uptake of any other essential plant element
  • soil factors that affect manganese uptake by plants:
    • soil test level
    • decomposition level of organic matter
    • soil pH:
      • acidic (low pH) increases manganese uptake
      • basic (high pH) decreases manganese uptake
  • plant factors that affect manganese uptake by plants:
    • hybrid or variety of plant
    • stage of growth
    • interactions with phosphorous

Roles of Manganese in Plant Functions

  • involved in the redox reaction for photosynthetic electron transport
  • essential in photosynthesis

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