Dr. Green Thumb Identification

Tree, Plant, Flower & Insect Identification

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Signs and Symptoms of Nutrient Deficiencies in Leaves
The leaf above is Iron deficient.
  Yellowing of tissue present:
  • in the younger  leaves (Fe, Mn).
  • middle of leaves (Mo).
  • older leaves (N, K, Mg, Zn).
  • Between leaf veins (Mg, Mn).
  • Old leaves drop (N).
  • leaf tips curl over the top (Mg).
  • leaf tips curl under (overfertilizing, K, Cu).
Leaf Tips Burn:
  •  younger leaves (B).
  • older leaves (N, Zn).
Other Signs:
  • young leaves wrinkle and curl (K, Zn, B, Mo).
  • necrotic tissue (K, Mg, Fe, Zn, Mn).
  • leaf growth stunted (N, P).
  • dark green/purplish leaves or stem (P).
  • pale green leaf color (N, Mo).
  • mottling (Zn).
  • spindly (N).
  • soft stems (N, K).
  • hard, brittle stems (P, K).
  • growing tips die (K, B).
  • stunted root growth (P).
  • wilting (Cu).
           

 

ELEMENT SYMBOL
Nitrogen N
Phosphorous P
Potassium K
Magnesium Mg
Chlorine Cl
Sodium Na
Sulfur S
Zinc Zn
Manganese Mn
Copper Cu
Molybdinum Mo
Boron B
Iron Fe
Calcium Ca
The deficiency here is Magnesium.
  
Mobile vs. Non-Mobile Nutrients
Mobile Nutrients easily move from the lower (older) leaves to the upper (younger) leaves and also into the phloem.  Deficiencies of mobile nutrients will always show up in the older leaves first.  Where as Non-Mobile Nutrients do not move as easily and deficiencies will show up in the younger leaves first.  Mobility is determined by solubility and the ability of plants to transport into the phloem.
 
Nutrients that are the:
 
Most Mobile:    N, P, K, Mg, Cl, Na 
Intermediate:  S, Zn, Mn, Cu, Mo
Non-Mobile:     B, Fe, Ca