Mo deficiency in Philadelphus

Mo deficiency in Philadelphus

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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 Container Nursery Stock

  • Ammonium molybdate ((NHâ‚„)₆Mo₇O₂₄·4Hâ‚‚O) – highly soluble, commonly used in fertigation or foliar sprays.
  • Sodium molybdate (Naâ‚‚MoO₄·2Hâ‚‚O) – soluble, quick correction via substrate or foliar application.
  • Molybdenum trioxide (MoO₃) – less soluble, used in slow-release or granular fertilizers.
  • Chelated molybdenum (Mo-EDDHA, Mo-DTPA) – stable in a range of pH conditions, effective in complexed micronutrient formulations.
  • Molybdic acid (Hâ‚‚MoOâ‚„) – occasionally used as a source in substrate amendments.

Molybdenum (Mo) Deficiency in Philadelphus – Container Nursery Stock

Symptoms

  • Pale or yellowing leaves, especially older foliage, due to impaired nitrogen metabolism.
  • Marginal leaf curling or cupping; leaves may become distorted.
  • Stunted growth and reduced internode elongation.
  • Poor flower development or abnormal flower formation in severe cases.
  • Leaves may show interveinal chlorosis in some cultivars.

Causes

  • Low molybdenum content in the growing medium.
  • Acidic substrate (low pH) reducing Mo availability.
  • Overuse of certain fertilizers (e.g., high nitrogen ammonium forms) that antagonize molybdenum uptake.
  • Poor irrigation management leading to leaching or uneven nutrient distribution.

Correction

  • Apply soluble molybdenum fertilizers via fertigation or foliar spray (e.g., ammonium molybdate, sodium molybdate).
  • Adjust substrate pH toward neutral (6.0–7.0) to improve Mo availability.
  • Ensure balanced fertilization, avoiding excessive ammonium nitrogen.

Prevention

  • Routine substrate testing and monitoring of micronutrient levels.
  • Maintain pH in the optimal range for chrysanthemum growth.
  • Use controlled-release or foliar micronutrient supplements as needed.
  • Rotate nutrient sources to avoid antagonistic effects on Mo uptake.

Mo deficiency in Philadelphus

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 Container Nursery Stock

  • Ammonium molybdate ((NHâ‚„)₆Mo₇O₂₄·4Hâ‚‚O) – highly soluble, commonly used in fertigation or foliar sprays.
  • Sodium molybdate (Naâ‚‚MoO₄·2Hâ‚‚O) – soluble, quick correction via substrate or foliar application.
  • Molybdenum trioxide (MoO₃) – less soluble, used in slow-release or granular fertilizers.
  • Chelated molybdenum (Mo-EDDHA, Mo-DTPA) – stable in a range of pH conditions, effective in complexed micronutrient formulations.
  • Molybdic acid (Hâ‚‚MoOâ‚„) – occasionally used as a source in substrate amendments.
Mo deficiency in Philadelphus
Image Source: PPO Boskoop (NL), care of ICL

Molybdenum (Mo) Deficiency in Philadelphus – Container Nursery Stock

Symptoms

  • Pale or yellowing leaves, especially older foliage, due to impaired nitrogen metabolism.
  • Marginal leaf curling or cupping; leaves may become distorted.
  • Stunted growth and reduced internode elongation.
  • Poor flower development or abnormal flower formation in severe cases.
  • Leaves may show interveinal chlorosis in some cultivars.

Causes

  • Low molybdenum content in the growing medium.
  • Acidic substrate (low pH) reducing Mo availability.
  • Overuse of certain fertilizers (e.g., high nitrogen ammonium forms) that antagonize molybdenum uptake.
  • Poor irrigation management leading to leaching or uneven nutrient distribution.

Correction

  • Apply soluble molybdenum fertilizers via fertigation or foliar spray (e.g., ammonium molybdate, sodium molybdate).
  • Adjust substrate pH toward neutral (6.0–7.0) to improve Mo availability.
  • Ensure balanced fertilization, avoiding excessive ammonium nitrogen.

Prevention

  • Routine substrate testing and monitoring of micronutrient levels.
  • Maintain pH in the optimal range for chrysanthemum growth.
  • Use controlled-release or foliar micronutrient supplements as needed.
  • Rotate nutrient sources to avoid antagonistic effects on Mo uptake.