Nutrients

N Nitrogen
P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
B Boron
Cu Copper
Fe Iron
Mn Manganese
Zn Zinc

Citrus - Deformation

Symptoms
Phosphorus deficiency leads to fruits with coarse and thick peel.

Reasons
Phosphorus deficiency on orange (right)

Citrus - Chlorosis

Symptoms
Symptoms begin at the mature leaves. They partly turn yellow. In severe cases small brownish to bronze freckles occur, spread over the leaf blade and coalesce. This discoloration is first appearing along the main veins.

Reasons
Phosphorus deficiency on leaf

Citrus - Chlorosis

Symptoms
Symptoms begin at the mature leaves.They partly turn yellow. In severe cases small brownish to bronze freckles occur, spread over the leaf blade and coalesce. This discoloration is first appearing along the main veins.

Reasons
Phosphorus deficiency on leaf

Phosphorus deficiency on orange made worse by

  • Acidic or very alkaline (calcareaus) soils
  • Low organic matter
  • Cold or wet conditions
  • Crops with a poorly developed root system
  • Soils with low P reserves
  • Soils with a high phosphate capacity
  • Iron rich soils

Phosphorus is important for

  • Vegetative growth increased
  • Leaves are much greener
  • Fruit set is increased
  • Yield boosted, fruit quality enhanced (sugar/acid improved)
  • Particularly important in young trees with poorly developed root systems