P deficiency in Hydrangea (Container Nursery Stock)

P deficiency in Hydrangea (Container Nursery Stock)

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Scientific Name
Phosphorus (P)
Atomic Number
15
Atomic Weight u
30.974
Elemental Group
Macro elements (N, P, K ) | Primary macronutrients
Available Forms

Available forms of Phosphorus (P) for use in Container Nursery Stock

  • Monoammonium phosphate (NH₄H₂PO₄, “MAP”) – highly soluble, quick correction for P deficiency.
  • Diammonium phosphate ((NH₄)₂HPO₄, “DAP”) – soluble, provides both N and P; commonly used in fertigation.
  • Superphosphate (Ca(H₂PO₄)₂·H₂O, “Single superphosphate”) – water-soluble source of P and Ca.
  • Triple superphosphate (Ca(H₂PO₄)₂·H₂O, “TSP”) – concentrated, high-P source for soil/substrate incorporation.
  • Monopotassium phosphate (KH₂PO₄, “MKP”) – soluble, supplies both K and P; suitable for fertigation.
  • Calcium phosphate (Ca₃(PO₄)₂) – slower-release, used in granular fertilizers.
  • Rock phosphate (various Ca-phosphate minerals, “phosphate rock”) – slow-release, low solubility; long-term correction.
  • Sodium phosphate (Na₃PO₄, “trisodium phosphate”) – highly soluble, used in specialty liquid fertilizers.
  • Chelated phosphate formulations – phosphate bound with organic acids for improved availability in certain pH ranges.

Phosphorus (P) Deficiency in Hydrangea – Container Nursery Stock

Symptoms

  • Stunted growth: young shoots and roots may be underdeveloped.
  • Dark green or purplish foliage: especially older leaves may take on a reddish-purple tint.
  • Delayed flowering: fewer and smaller blooms.
  • Poor root development: roots appear thin, short, and sparse.
  • Leaf curling or tip burn: sometimes observed in severe deficiencies.

Causes

  • Low phosphorus availability in the growing media, especially in acidic or high-pH substrates.
  • Excessive nitrogen fertilization: high N can suppress P uptake.
  • Cool soil temperatures: P mobility in substrate is reduced under cold conditions.
  • High calcium or aluminum levels: can bind P and reduce availability.

Correction

  • Foliar feeding: use soluble phosphate sources (e.g., mono- or diammonium phosphate) for quick correction.
  • Substrate fertilization: incorporate P fertilizers at recommended rates for container media.
  • Maintain balanced nutrition: avoid excessive N or Ca that may inhibit P uptake.
  • Monitor pH: keep substrate pH in the optimal range (around 5.5–6.5) to maximize P availability.
  • Use slow-release fertilizers containing phosphorus for steady long-term supply.

Prevention

  • Foliar feeding: use soluble phosphate sources (e.g., mono- or diammonium phosphate) for quick correction.
  • Substrate fertilization: incorporate P fertilizers at recommended rates for container media.
  • Maintain balanced nutrition: avoid excessive N or Ca that may inhibit P uptake.
  • Monitor pH: keep substrate pH in the optimal range (around 5.5–6.5) to maximize P availability.
  • Use slow-release fertilizers containing phosphorus for steady long-term supply.

P deficiency in Hydrangea (Container Nursery Stock)

Phosphorus (P)
Scientific Name
Phosphorus (P)
Atomic Number
15
Atomic Weight u
30.974
Elemental Group
Macro elements (N, P, K ) | Primary macronutrients
Available Forms

Available forms of Phosphorus (P) for use in Container Nursery Stock

  • Monoammonium phosphate (NH₄H₂PO₄, “MAP”) – highly soluble, quick correction for P deficiency.
  • Diammonium phosphate ((NH₄)₂HPO₄, “DAP”) – soluble, provides both N and P; commonly used in fertigation.
  • Superphosphate (Ca(H₂PO₄)₂·H₂O, “Single superphosphate”) – water-soluble source of P and Ca.
  • Triple superphosphate (Ca(H₂PO₄)₂·H₂O, “TSP”) – concentrated, high-P source for soil/substrate incorporation.
  • Monopotassium phosphate (KH₂PO₄, “MKP”) – soluble, supplies both K and P; suitable for fertigation.
  • Calcium phosphate (Ca₃(PO₄)₂) – slower-release, used in granular fertilizers.
  • Rock phosphate (various Ca-phosphate minerals, “phosphate rock”) – slow-release, low solubility; long-term correction.
  • Sodium phosphate (Na₃PO₄, “trisodium phosphate”) – highly soluble, used in specialty liquid fertilizers.
  • Chelated phosphate formulations – phosphate bound with organic acids for improved availability in certain pH ranges.
P deficiency in Hydrangea (Container Nursery Stock)
Image Source: Everris Research (NL), care of ICL

Phosphorus (P) Deficiency in Hydrangea – Container Nursery Stock

Symptoms

  • Stunted growth: young shoots and roots may be underdeveloped.
  • Dark green or purplish foliage: especially older leaves may take on a reddish-purple tint.
  • Delayed flowering: fewer and smaller blooms.
  • Poor root development: roots appear thin, short, and sparse.
  • Leaf curling or tip burn: sometimes observed in severe deficiencies.

Causes

  • Low phosphorus availability in the growing media, especially in acidic or high-pH substrates.
  • Excessive nitrogen fertilization: high N can suppress P uptake.
  • Cool soil temperatures: P mobility in substrate is reduced under cold conditions.
  • High calcium or aluminum levels: can bind P and reduce availability.

Correction

  • Foliar feeding: use soluble phosphate sources (e.g., mono- or diammonium phosphate) for quick correction.
  • Substrate fertilization: incorporate P fertilizers at recommended rates for container media.
  • Maintain balanced nutrition: avoid excessive N or Ca that may inhibit P uptake.
  • Monitor pH: keep substrate pH in the optimal range (around 5.5–6.5) to maximize P availability.
  • Use slow-release fertilizers containing phosphorus for steady long-term supply.

Prevention

  • Foliar feeding: use soluble phosphate sources (e.g., mono- or diammonium phosphate) for quick correction.
  • Substrate fertilization: incorporate P fertilizers at recommended rates for container media.
  • Maintain balanced nutrition: avoid excessive N or Ca that may inhibit P uptake.
  • Monitor pH: keep substrate pH in the optimal range (around 5.5–6.5) to maximize P availability.
  • Use slow-release fertilizers containing phosphorus for steady long-term supply.