Nutrients

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

Tomato - Chlorosis

Symptoms
The older leaves become chlorotic, later necrotic, starting from the leaf edges. At severe deficiency, the intercostal areas of the leaves may become chlorotic, too. Whitish, necrotic dots develop within the chlorotic areas.

Reasons
Potassium deficiency on the leaves. Excess salinity may cause similar symptoms, this can be controlled by measuring the electrical conductivity (EC) of the nutrient solution.

Tomato - Chlorosis

Symptoms
The older leaves become chlorotic, later necrotic, starting from the leaf edges. At severe deficiency, the intercostal areas of the leaves may become chlorotic, too. Light brown and whitish, necrotic dots develop within the chlorotic areas.

Reasons
Potassium deficiency on the leaves. Excess salinity may cause similar symptoms, this can be controlled by measuring the electrical conductivity (EC) of the nutrient solution.

Tomato - Discolouration

Symptoms
Glasshouse grown tomatoes will often express potassium deficiency as blotchy ripening. When fruits turn red some areas remain green. The symptoms are sometimes visible in field grown tomatoes, too.

Reasons
Potassium deficiency on fruits

Potassium deficiency made worse by

  • Acidic soils (low pH)
  • Sandy or light soils (leaching)
  • Drought conditions
  • High rainfall (leaching)
  • or heavy irrigation
  • Heavy clay (illite) soils
  • Soils with low K reserves
  • Magnesium rich soils

Potassium is important for

  • Coenzyme functions
  • Protein synthesis
  • Stomatal function
  • Tugor potential
  • Sugar degree

Other recommended products

YaraTera KRISTA K PLUS
Tomato (indoor): Crop specific recipes for 2 tank (A & B tank) systems can be produced using the Yara Fertigation Plan, for more details contact your local Yara area manager.
YaraTera KRISTA MKP
Tomato (indoor): Crop specific recipes for 2 tank (A & B tank) systems can be produced using the Yara Fertigation Plan, for more details contact your local Yara area manager.
YaraTera KRISTA SOP
Tomato (indoor): Crop specific recipes for 2 tank (A & B tank) systems can be produced using the Yara Fertigation Plan, for more details contact your local Yara area manager.