Fe deficiency in Cham. laws. 'Columnaris'

Fe deficiency in Cham. laws. 'Columnaris'

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Scientific Name
Iron (Fe)
Atomic Number
26
Atomic Weight u
55.845
Elemental Group
Micro elements (B, Cl, Cu, Fe, Mn, Mo, Ni, Zn) | Micronutrients
Available Forms

Available forms of Iron (Fe) for use in Container Nursery Stock

  • Ferrous sulfate (FeSO₄·7Hâ‚‚O, 'Iron sulfate') – soluble, quick corrective; used in foliar sprays and drenches.
  • Ferric sulfate (Feâ‚‚(SOâ‚„)₃, 'Iron(III) sulfate') – soluble, strong acidifying effect; less common but effective in some media drenches.
  • Iron chelate (Fe-EDDHA, 'EDDHA-Fe') – highly stable, effective up to pH 9; best for high-pH container media.
  • Iron chelate (Fe-DTPA, 'DTPA-Fe') – stable up to about pH 7; widely used in fertigation for container crops.
  • Iron chelate (Fe-EDTA, 'EDTA-Fe') – economical, but only effective at low pH (≤6).
  • Iron citrate (C₆Hâ‚…FeO₇, 'Ferric citrate') – soluble organic form; sometimes used in foliar applications.
  • Iron lignosulfonate (varied formula, 'Iron lignosulfonate') – chelated with organic acids; used as soil or media amendment.
  • Iron frits (varied composition, 'Slow-release Fe frits') – glass-fused carriers providing slow, controlled Fe release in container mixes.

Iron (Fe) Deficiency in Chamaecyparis lawsoniana ‘Columnaris’ (Container Nursery Stock)

Symptoms

  • Young foliage shows interveinal chlorosis – needles turn pale yellow while veins and midrib may stay slightly greener.
  • In advanced cases, new growth appears almost whitish, giving the plant a bleached look.
  • Reduced growth rate; shoots may become weak and spindly.
  • Prolonged deficiency may cause necrosis of needle tips and dieback of young shoots.
  • Overall plant appears stunted, with reduced ornamental value (important for retail presentation).

Causes

  • High substrate pH (>6.0) limiting Fe solubility and uptake.
  • Irrigation water with high bicarbonate or carbonate alkalinity, raising media pH over time.
  • Overuse of lime or alkaline amendments in container mix preparation.
  • Excess phosphorus (P) fertilization tying up Fe in the media.
  • High manganese (Mn), zinc (Zn), or copper (Cu) levels competing with Fe uptake.
  • Poor root health from waterlogging, compaction, or root pathogens reducing Fe absorption capacity.
  • Conifers like Chamaecyparis are naturally sensitive to Fe unavailability in alkaline conditions.

Correction

  • Foliar sprays with iron chelates (Fe-EDDHA, Fe-DTPA, or Fe-EDTA depending on pH) for immediate greening response.
  • Soil or substrate drenches with Fe-chelates:
  • Fe-EDDHA is most effective under high pH conditions.
  • Fe-DTPA suitable for neutral to slightly acidic conditions.
  • Apply iron sulfate (FeSO₄·7Hâ‚‚O) as a short-term drench or foliar spray (with caution to avoid leaf burn).
  • Acidify irrigation water (e.g., with sulfuric or phosphoric acid) if alkalinity is high.
  • Use ammonium-based N fertilizers instead of nitrate forms to encourage localized acidification at the root zone.

Prevention

Fe deficiency in Cham. laws. 'Columnaris'

Scientific Name
Iron (Fe)
Atomic Number
26
Atomic Weight u
55.845
Elemental Group
Micro elements (B, Cl, Cu, Fe, Mn, Mo, Ni, Zn) | Micronutrients
Available Forms

Available forms of Iron (Fe) for use in Container Nursery Stock

  • Ferrous sulfate (FeSO₄·7Hâ‚‚O, 'Iron sulfate') – soluble, quick corrective; used in foliar sprays and drenches.
  • Ferric sulfate (Feâ‚‚(SOâ‚„)₃, 'Iron(III) sulfate') – soluble, strong acidifying effect; less common but effective in some media drenches.
  • Iron chelate (Fe-EDDHA, 'EDDHA-Fe') – highly stable, effective up to pH 9; best for high-pH container media.
  • Iron chelate (Fe-DTPA, 'DTPA-Fe') – stable up to about pH 7; widely used in fertigation for container crops.
  • Iron chelate (Fe-EDTA, 'EDTA-Fe') – economical, but only effective at low pH (≤6).
  • Iron citrate (C₆Hâ‚…FeO₇, 'Ferric citrate') – soluble organic form; sometimes used in foliar applications.
  • Iron lignosulfonate (varied formula, 'Iron lignosulfonate') – chelated with organic acids; used as soil or media amendment.
  • Iron frits (varied composition, 'Slow-release Fe frits') – glass-fused carriers providing slow, controlled Fe release in container mixes.
Fe deficiency in Cham. laws. 'Columnaris'

Iron (Fe) Deficiency in Chamaecyparis lawsoniana ‘Columnaris’ (Container Nursery Stock)

Symptoms

  • Young foliage shows interveinal chlorosis – needles turn pale yellow while veins and midrib may stay slightly greener.
  • In advanced cases, new growth appears almost whitish, giving the plant a bleached look.
  • Reduced growth rate; shoots may become weak and spindly.
  • Prolonged deficiency may cause necrosis of needle tips and dieback of young shoots.
  • Overall plant appears stunted, with reduced ornamental value (important for retail presentation).

Causes

  • High substrate pH (>6.0) limiting Fe solubility and uptake.
  • Irrigation water with high bicarbonate or carbonate alkalinity, raising media pH over time.
  • Overuse of lime or alkaline amendments in container mix preparation.
  • Excess phosphorus (P) fertilization tying up Fe in the media.
  • High manganese (Mn), zinc (Zn), or copper (Cu) levels competing with Fe uptake.
  • Poor root health from waterlogging, compaction, or root pathogens reducing Fe absorption capacity.
  • Conifers like Chamaecyparis are naturally sensitive to Fe unavailability in alkaline conditions.

Correction

  • Foliar sprays with iron chelates (Fe-EDDHA, Fe-DTPA, or Fe-EDTA depending on pH) for immediate greening response.
  • Soil or substrate drenches with Fe-chelates:
  • Fe-EDDHA is most effective under high pH conditions.
  • Fe-DTPA suitable for neutral to slightly acidic conditions.
  • Apply iron sulfate (FeSO₄·7Hâ‚‚O) as a short-term drench or foliar spray (with caution to avoid leaf burn).
  • Acidify irrigation water (e.g., with sulfuric or phosphoric acid) if alkalinity is high.
  • Use ammonium-based N fertilizers instead of nitrate forms to encourage localized acidification at the root zone.

Prevention