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Nutrient Benefits


High K levels can reduce the availability of:

  • Boron
  • Magnesium


Increased K levels can create a demand for more:

  • Iron
  • Manganese


  • Aids in photosynthesis and the functioning of chlorophyll
  • Formation and translocation of starches, sugars, and fats
  • Protein formation
  • Aids with enzyme actions
  • Maintenance of cell internal pressure
  • Reduces wilting and respiration by maintaining balance of salts and water in cells
  • Improves crop quality
  • Increases root growth and resistance to disease and drought
  • Decreases lodging

Deficiency Symptoms

  • Light green, yellow older leaves which develops into leaf scorch
  • Stunted growth
  • Lodging
  • Reduced disease resistance
  • Weakened stalks
  • Misshapen seed and fruit

Factors Affecting Availability

  • Continuously cropped soils with low levels of organic matter
  • Soils without balanced fertilizer programs
  • Light, sandy soils where K has been leached
  • Periods of drought
  • Heavily limed soil
  • Prolonged periods of heavy rain in some soils (e.g. Red Ferrosoil)
  • Soils in which deficiencies of P and Mo have been corrected
  • Soils formed from parent material low in K

Sensitive Crops

Cereals, corn, canola, pulses, beans, peas, sunflowers, potatoes, tomatoes, broccoli, rhubarb, cucurbits, lettuce, apples, berries, citrus, grapes, nuts, passionfruit, stone fruit


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

Visual Guide