Potassium Sulphate

Product characteristics

Calcium Nitrate

  • Fully water soluble crystalline product
  • Free of Chloride, Sodium and heavy metals.
  • Nitrogen-free, essential for the final phase of the growth cycle
  • Lowers the pH in the rhizosphere of alkaline soils and improves availability of phosphates and certain trace elements.
  • Reduces the pH of irrigation water In drip irrigation installations
  • Used for foliar feeding, fertigation and as an ingredient for NPKs.
  • Compatible with most water-soluble fertilizers


Dosing information

Dosing instructions | Fertigation

Crop Application date Application rate in kg/ha/year
- Deciduous fruit trees (bearing)
- Citrus trees (bearing)
Start after fruit-set, continue throughout the irrigation season until 3-4 weeks prior to harvest 150 – 350 kg
Vineyard (bearing table grapes) From initiation of spring bud opening, continue throughout the irrigation season until 3-4 weeks prior to harvest 100 – 250 kg
Pistachio Throughout vegetative growth season; ~1/3 of annual rate during fruit development. 170 – 300 kg
Vegetables (fruit bearing) From early vegetative growth until 3-4 weeks prior to harvest 100 – 300 kg
Processing potatoes From tuber initiation until mid-tuber-bulking 100 – 200 kg
Processing tomatoes Start at 4 weeks until fruit maturation 150 – 300 kg

Dosing instructions | Foliar application

Crop Application date Application rate in kg/ha/application* Application rate in %w/v
- Deciduous fruit trees
- Olive trees/ Citrus
- Table grapes (adult)
3 – 5 applications, starting after fruit-set, at 14-21 days intervals. 7 – 10 kg/hа 2 – 3.5%
Fruit vegetables 1-3 applications, at ~14-days intervals, during vegetative growth, and after flowering - 5 – 8 kg/ha - 1.0 – 1.5%
Leaf vegetables,
e.g. celery
3 applications, from 4 weeks after transplanting, at 10-15 days
intervals during vegetative growth.
5 – 8 kg/ha 1.0 – 1.2%
Potato, sweet-potato 3 applications, from 3 weeks after transplanting, at ~10-15 days intervals 4 – 6 kg/ha 2.5 – 3.2%
- Carrot, Bulb onion
- Rape, turnip
3 applications, from 4 weeks after germination, at ~10-15 days intervals 3 – 5 kg/ha
5 – 8 kg/ha
2.0 – 3.0 %
2.5 – 3.5 %
Sugar beet 2-3 applications, during root bulking 5 – 8 kg/ha 3.0 – 5.0%
Oil-seed rape 1-2 applications, during vegetative growth until flowering 3 – 6 kg/ha 1.0 – 1.5%


Available in packaging of 25kg and 1.000kg.

Function of potassium

Unlike nitrogen and phosphate, potassium does not form any vital organic compounds in the plant. However, the presence of potassium is vital for plant growth because potassium is an enzyme activator that promotes metabolism. It also assists in regulating the plant’s use of water by controlling the opening and closing of leaf stomates where water is released to cool the plant. Sufficient potassium in the levels will increase the plant’s drought tolerance.
In photosynthesis, potassium has the role of maintaining the balance of electrical charges at the site of ATP production. Furthermore, potassium promotes the translocation of photosythates (sugars) for plant growth or storage in fruits or roots. It is also involved in protein synthesis. Finally, potassium improves disease resistance, the size of grains and seeds and the quality of fruits and vegetables.

Deficiency of Potassium

Mild chlorosis progressing into dry and leathery burns on recently matured leaves is the first indicator of potassium deficiency. In the next phase of the process, the veins also become scorched or necrosis will set in from the edge of the leave to the inside. Next, the interveinal areas also become necrotic. The veins themselves stay green. The leaves tend to curl and crinkle. In some plants such as legumes and potato, the initial sign of deficiency is a white speckling of the leaves.
Chlorosis as a consequence of potassium deficiency is an irreversible process – even when potassium is applied. The effect of potassium deficiency can be reduced by the presence of sodium, but sodium-rich plants are more succulent than potassium-rich plant.
 Potassium-deficiency-on-vine-leafs  Potassium-deficiency-on-potato-leaves