Nitrogen (N) Deficiency

Nitrogen (N) Deficiency

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Scientific Name
Nitrogen (N)
Atomic Number
7
Atomic Weight u
14.007
Elemental Group
Macro elements (N, P, K ) | Primary macronutrients
Available Forms

Available forms of Nitrogen (N) for Horticultural Production

  • Urea (CO(NH₂)₂) – highly soluble, concentrated source; rapid uptake via fertigation or foliar sprays.
  • Ammonium nitrate (NH₄NO₃) – soluble, provides both ammonium (NH₄⁺) and nitrate (NO₃⁻) forms for quick correction.
  • Calcium nitrate [Ca(NO₃)₂·4H₂O] – supplies nitrate N and Ca²⁺; prevents Ca deficiency while correcting N shortage.
  • Potassium nitrate (KNO₃) – soluble, supplies both nitrate N and K⁺; ideal for fertigation and foliar feeding.
  • Ammonium sulfate ((NH₄)₂SO₄) – provides ammonium N and sulfur; acidifying, useful in alkaline substrates.
  • Magnesium nitrate [Mg(NO₃)₂·6H₂O] – soluble, provides nitrate N and Mg²⁺; suitable for combined corrections.
  • Sodium nitrate (NaNO₃) – soluble nitrate source; less common due to sodium content.
  • Ammonium phosphate (monoammonium NH₄H₂PO₄, diammonium (NH₄)₂HPO₄) – supplies ammonium N and phosphorus together.
  • Calcium ammonium nitrate (CAN) – blend of Ca(NO₃)₂ and NH₄NO₃; balanced source of N and Ca, moderate release.
  • Ammonium bicarbonate (NH₄HCO₃) – soluble ammonium source, used occasionally in fertigation.
  • Slow-release N fertilizers (e.g., coated urea, sulfur/polymer-coated ammonium) – provide a steady supply, reduce leaching losses.
  • Organic N sources (e.g., blood meal, fish emulsion, soybean meal) – slower mineralization, dependent on microbial activity.
  • Foliar nitrate-based feeds (e.g., potassium nitrate sprays) – rapid correction for visible deficiency symptoms.

Nitrogen (N) Deficiency

Container Nursery Stock, Pot & Bedding Plants

Symptoms

  • General growth reduction: plants are stunted, with shorter stems, thinner shoots, and reduced vigor.
  • Chlorosis: older leaves turn pale green to yellow first (N is mobile), while younger leaves remain greener initially.
  • Premature leaf drop: lower or older leaves abscise early in moderate to severe cases.
  • Smaller leaves and poor branching; foliage may appear sparse and less dense.
  • Poor flowering: fewer or smaller flowers, delayed bloom, or pale bracts with reduced color intensity.

Causes

  • Insufficient nitrogen in substrate or nutrient solution due to under-fertilization or poor-quality growing media.
  • Excessive leaching from frequent irrigation, heavy rainfall, or substrates with low cation exchange capacity (CEC).
  • Nutrient imbalance: excess potassium (K), calcium (Ca), or ammonium (NH₄⁺) can suppress N uptake.
  • Slow-release fertilizers with inadequate or uneven N release failing to meet crop demand.
  • Stress factors such as overcrowding, root disease, or poor substrate pH affecting uptake efficiency.

Correction

  • Apply soluble N fertilizers (e.g., urea, ammonium nitrate, calcium nitrate) through fertigation or as a substrate drench for rapid recovery.
  • Foliar sprays with dilute N solutions (e.g., urea, calcium nitrate) for quick greening of chlorotic leaves.
  • Use balanced fertilizers with correct N:P:K ratios suited to the crop type and growth stage.
  • Incorporate slow- or controlled-release N sources, or organic amendments, to sustain supply over time.
  • Monitor substrate pH (optimal 5.5–6.5 for most pot and bedding plants) and adjust if necessary.

Prevention

  • Maintain a fertilization program that includes adequate and balanced nitrogen supply throughout the crop cycle.
  • Use substrates with sufficient nutrient-holding capacity to reduce leaching losses.
  • Monitor nutrient levels, substrate pH, and electrical conductivity (EC) regularly.
  • Avoid excessive irrigation; ensure good drainage to minimize nutrient washout while preventing root stress.
  • Include slow-release or organic nitrogen sources to provide steady supply and reduce risk of deficiency.

Nitrogen (N) Deficiency

Scientific Name
Nitrogen (N)
Atomic Number
7
Atomic Weight u
14.007
Elemental Group
Macro elements (N, P, K ) | Primary macronutrients
Available Forms

Available forms of Nitrogen (N) for Horticultural Production

  • Urea (CO(NH₂)₂) – highly soluble, concentrated source; rapid uptake via fertigation or foliar sprays.
  • Ammonium nitrate (NH₄NO₃) – soluble, provides both ammonium (NH₄⁺) and nitrate (NO₃⁻) forms for quick correction.
  • Calcium nitrate [Ca(NO₃)₂·4H₂O] – supplies nitrate N and Ca²⁺; prevents Ca deficiency while correcting N shortage.
  • Potassium nitrate (KNO₃) – soluble, supplies both nitrate N and K⁺; ideal for fertigation and foliar feeding.
  • Ammonium sulfate ((NH₄)₂SO₄) – provides ammonium N and sulfur; acidifying, useful in alkaline substrates.
  • Magnesium nitrate [Mg(NO₃)₂·6H₂O] – soluble, provides nitrate N and Mg²⁺; suitable for combined corrections.
  • Sodium nitrate (NaNO₃) – soluble nitrate source; less common due to sodium content.
  • Ammonium phosphate (monoammonium NH₄H₂PO₄, diammonium (NH₄)₂HPO₄) – supplies ammonium N and phosphorus together.
  • Calcium ammonium nitrate (CAN) – blend of Ca(NO₃)₂ and NH₄NO₃; balanced source of N and Ca, moderate release.
  • Ammonium bicarbonate (NH₄HCO₃) – soluble ammonium source, used occasionally in fertigation.
  • Slow-release N fertilizers (e.g., coated urea, sulfur/polymer-coated ammonium) – provide a steady supply, reduce leaching losses.
  • Organic N sources (e.g., blood meal, fish emulsion, soybean meal) – slower mineralization, dependent on microbial activity.
  • Foliar nitrate-based feeds (e.g., potassium nitrate sprays) – rapid correction for visible deficiency symptoms.
Nitrogen (N) Deficiency

Nitrogen (N) Deficiency

Container Nursery Stock, Pot & Bedding Plants

Symptoms

  • General growth reduction: plants are stunted, with shorter stems, thinner shoots, and reduced vigor.
  • Chlorosis: older leaves turn pale green to yellow first (N is mobile), while younger leaves remain greener initially.
  • Premature leaf drop: lower or older leaves abscise early in moderate to severe cases.
  • Smaller leaves and poor branching; foliage may appear sparse and less dense.
  • Poor flowering: fewer or smaller flowers, delayed bloom, or pale bracts with reduced color intensity.

Causes

  • Insufficient nitrogen in substrate or nutrient solution due to under-fertilization or poor-quality growing media.
  • Excessive leaching from frequent irrigation, heavy rainfall, or substrates with low cation exchange capacity (CEC).
  • Nutrient imbalance: excess potassium (K), calcium (Ca), or ammonium (NH₄⁺) can suppress N uptake.
  • Slow-release fertilizers with inadequate or uneven N release failing to meet crop demand.
  • Stress factors such as overcrowding, root disease, or poor substrate pH affecting uptake efficiency.

Correction

  • Apply soluble N fertilizers (e.g., urea, ammonium nitrate, calcium nitrate) through fertigation or as a substrate drench for rapid recovery.
  • Foliar sprays with dilute N solutions (e.g., urea, calcium nitrate) for quick greening of chlorotic leaves.
  • Use balanced fertilizers with correct N:P:K ratios suited to the crop type and growth stage.
  • Incorporate slow- or controlled-release N sources, or organic amendments, to sustain supply over time.
  • Monitor substrate pH (optimal 5.5–6.5 for most pot and bedding plants) and adjust if necessary.

Prevention

  • Maintain a fertilization program that includes adequate and balanced nitrogen supply throughout the crop cycle.
  • Use substrates with sufficient nutrient-holding capacity to reduce leaching losses.
  • Monitor nutrient levels, substrate pH, and electrical conductivity (EC) regularly.
  • Avoid excessive irrigation; ensure good drainage to minimize nutrient washout while preventing root stress.
  • Include slow-release or organic nitrogen sources to provide steady supply and reduce risk of deficiency.