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Nutrient Benefits


High Ca levels can reduce the availability of:

  • Manganese
  • Potassium
  • Iron
  • Sodium and Aluminium
  • Boron
  • Zinc
  • Magnesium
  • Phosphorus


  • Ca stimulates Boron uptake and translocation


  • Proper functioning of growing points, particularly roots tips
  • Forms compounds which strengthen cell walls
  • Aids in cell division and elongation
  • Neutralizes organic acids
  • Aids in the proper working and permeability of cell membranes
  • Regulates protein synthesis and slows aging process

Deficiency Symptoms

  • Soft fruit
  • Senescent breakdown and poor storage life of fruit
  • Internal and external disorders or many fruits and vegetables
  • Lodging
  • Terminal buds and root tips fail to develop normally
  • Stunted root systems
  • Leaves of grasses do not open properly, tips stick to the next lowest leaf

Factors Affecting Availability

  • Where there is an unfavorable balance of Ca, Mg, and K in the soil (particularly heavy K inputs in sandy soils)
  • Where high rates of N have been used
  • Low pH soils

Sensitive Crops

  • Ca is not easily translocated in plants, so a constant supply is required. It should be foliar applied and in fruiting crops, and be available from after flowering onward
  • Tree crops, fruit, and vegetables
  • Pod crops, cereals, canola, pulses


The following OMEX products can assist with addressing and correcting Calcium deficiency:

Visual Guide