Molybdenum (Mo)

  • molybdenum 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: molybdate anion (MoO42-)
  • amount required for healthy plant growth: 0.1 ppm, dry soil matter
    • amount of molybdenum required is greatly reduced if the form of nitrogen supplied to the plant is ammonium (NH4)
  • molybdate anions primarily move through the soil via diffusion
  • soil conditions related to deficiencies in molybdenum:
    • low in sandy soils
    • increases in availability with pH
    • liming corrects Mo deficiencies
  • soil factors that affect molybdenum uptake by plants:
    • soil test level
    • decomposition level of organic matter
    • soil pH: basic (high pH) increases molybdenum uptake
  • plant factors that affect molybdenum uptake by plants:
    • hybrid or variety of plant
    • stage of growth
    • interactions with other elements

Roles of Molybdenum in Plant Functions

  • component of two major enzyme systems for nitrogen utilization

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