Mo deficiency in Chrysanthemum

Mo deficiency in Chrysanthemum

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Scientific Name
Molybdenum (Mo)
Atomic Number
42
Atomic Weight u
95.95
Elemental Group
Micro elements (B, Cl, Cu, Fe, Mn, Mo, Ni, Zn) | Micronutrients
Available Forms

Available forms of Molybdenum (Mo) for use in Pot and Bedding Plants

  • Ammonium molybdate ((NHâ‚„)₆Mo₇O₂₄·4Hâ‚‚O) – highly soluble, commonly used in foliar sprays and fertigation.
  • Sodium molybdate (Naâ‚‚MoO₄·2Hâ‚‚O) – soluble, provides Mo for substrate or foliar application.
  • Potassium molybdate (Kâ‚‚MoOâ‚„) – soluble, less common, supplies both K and Mo.
  • Chelated molybdenum (Mo-EDTA) – stable in solution, used in fertigation systems.
  • Mo-enriched micronutrient mixes – controlled-release formulations supplying Mo along with other trace elements.

Molybdenum (Mo) Deficiency in Chrysanthemum – Pot and Bedding Plants

Symptoms

  • Young leaves may appear pale green or yellow, often with marginal or interveinal chlorosis.
  • Distorted or cupped leaves may develop.
  • Stunted growth and reduced flowering can occur.
  • Necrotic spots may appear in severe cases.

Causes

  • Low Mo availability in acidic soils or growing media (pH < 5.5).
  • Excessive leaching in highly porous substrates.
  • Overuse of ammonium-based fertilizers, which can reduce Mo uptake.
  • Imbalance with other nutrients, particularly high levels of iron, manganese, or sulfur.

Correction

  • Apply Mo through foliar sprays (e.g., ammonium molybdate or sodium molybdate) for rapid correction.
  • Incorporate Mo into the substrate using soluble molybdenum salts.
  • Adjust substrate pH toward neutral if feasible to improve Mo availability.

Prevention

  • Monitor substrate pH regularly, keeping it near neutral for optimal Mo uptake.
  • Use balanced fertilization, avoiding over-application of ammonium-based fertilizers.
  • Include Mo-containing micronutrient formulations in routine fertilization programs.
  • Test media periodically to ensure sufficient Mo levels are maintained.

Mo deficiency in Chrysanthemum

Molybdenum (Mo)
Scientific Name
Molybdenum (Mo)
Atomic Number
42
Atomic Weight u
95.95
Elemental Group
Micro elements (B, Cl, Cu, Fe, Mn, Mo, Ni, Zn) | Micronutrients
Available Forms

Available forms of Molybdenum (Mo) for use in Pot and Bedding Plants

  • Ammonium molybdate ((NHâ‚„)₆Mo₇O₂₄·4Hâ‚‚O) – highly soluble, commonly used in foliar sprays and fertigation.
  • Sodium molybdate (Naâ‚‚MoO₄·2Hâ‚‚O) – soluble, provides Mo for substrate or foliar application.
  • Potassium molybdate (Kâ‚‚MoOâ‚„) – soluble, less common, supplies both K and Mo.
  • Chelated molybdenum (Mo-EDTA) – stable in solution, used in fertigation systems.
  • Mo-enriched micronutrient mixes – controlled-release formulations supplying Mo along with other trace elements.
Mo deficiency in Chrysanthemum
Image Source: WUR Glastuinbouw, Bleiswijk (NL), care of ICL

Molybdenum (Mo) Deficiency in Chrysanthemum – Pot and Bedding Plants

Symptoms

  • Young leaves may appear pale green or yellow, often with marginal or interveinal chlorosis.
  • Distorted or cupped leaves may develop.
  • Stunted growth and reduced flowering can occur.
  • Necrotic spots may appear in severe cases.

Causes

  • Low Mo availability in acidic soils or growing media (pH < 5.5).
  • Excessive leaching in highly porous substrates.
  • Overuse of ammonium-based fertilizers, which can reduce Mo uptake.
  • Imbalance with other nutrients, particularly high levels of iron, manganese, or sulfur.

Correction

  • Apply Mo through foliar sprays (e.g., ammonium molybdate or sodium molybdate) for rapid correction.
  • Incorporate Mo into the substrate using soluble molybdenum salts.
  • Adjust substrate pH toward neutral if feasible to improve Mo availability.

Prevention

  • Monitor substrate pH regularly, keeping it near neutral for optimal Mo uptake.
  • Use balanced fertilization, avoiding over-application of ammonium-based fertilizers.
  • Include Mo-containing micronutrient formulations in routine fertilization programs.
  • Test media periodically to ensure sufficient Mo levels are maintained.