Certifications
Van Iperen Potassium Sulphate (SOP) Horticultural Grade is the first water-soluble Potassium Sulphate fertilizer produced through a circular process with a minimized carbon footprint, by our Swedish partner CINIS Fertilizer. It is a highly pure, fast-dissolving Potassium fertilizer suitable for greenhouse and open-field fertigation as well as foliar application. Non-caking and ideal from fruit or tuber development through maturation, it supports high-quality yields. By using GreenSwitch® SOP, growers reduce their carbon footprint and switch to sustainable high-tech agriculture.
- The first circular Potassium Sulphate fertilizer
- Patented, significantly reduced Carbon footprint production process
- Improves fruit quality, shelf life and increases plant drought resistance
- Limits vegetative growth as of fruit setting
- Developed for fertigation in open field and greenhouses. Also suitable for foliar application
Certifications
- Low in heavy metals
- Low in Sodium and Chloride
- Easy to handle, dissolve and apply
Hydroponics
| Kg in 1.000 l stock solution | K2O in kg | SO3 in kg1 |
|---|---|---|
| 25 | 12.7 | 11.2 |
| 50 | 25.5 | 22.5 |
| 75 | 38.2 | 33.7 |
| 100 | 51 | 45 |
Fertigation
| Crop | Application date | Min kg/ha/season | Max kg/ha/season |
|---|---|---|---|
Apple |
• As of fruit setting • During fruit growth • Until fruit ripening |
200 | 400 |
Almond |
• As of end of flowering • Until 2 weeks before harvesting |
150 | 300 |
Pistachio |
• As of vegetative growth • Until fruit filling |
170 | 300 |
Vegetables |
• As of first leaves forming • Until harvesting |
100 | 300 |
Soft fruit |
• As of vegetative growth • Until 4 weeks before harvesting |
100 | 300 |
Citrus  |
• As of fruit setting • Until 4 weeks before harvesting |
150 | 350 |
Vineyards |
• As of fruit setting • Until harvesting |
200 | 400 |
Table grape |
• As of fruit setting • Until 4 weeks before harvesting |
200 | 400 |
| Vineyards (adult) |
• As of flower bud opening • Until 4 weeks before harvesting |
100 | 250 |
| Table grape |
• As of flower bud opening • Until 4 weeks before harvesting |
200 | 500 |
Potato |
• As of tuber setting • Until tuber filling |
100 | 200 |
Banana |
• As of plant establishment • During entire fertigation program |
300 | 500 |
Asparagus |
• During entire fertigation program | 200 | 300 |
Foliar Application
| Crop | Application date | Min kg / ha / appl | Max kg / ha / appl | Conc. % (w/v)) |
|---|---|---|---|---|
Fruit trees |
3 - 5 applications: • As of fruit setting • 14 - 21 days interval |
7 | 10 | 1.0 - 2.0 |
| Vegetables |
1 - 3 applications: • During vegetative growth • As of fruit setting • 10 - 14 days interval |
5 | 8 | 0.5 - 1.0 |
| Soft fruit |
• As of fruit setting • During fruit filling |
4 | 6 | 0.5 - 0.8 |
| Citrus |
3 - 5 applications: • As of fruit setting • 14 - 21 days interval |
9 | 12 | 2.0 - 3.0 |
| Vineyards |
3 - 5 applications: • As of fruit setting • 14 - 21 days interval |
7 | 10 | 1.2 - 2.0 |
| Table grape |
3 - 5 applications: • As of fruit setting • 14 - 21 days interval |
7 | 10 | 1.5 - 2.0 |
Carrots |
3 applications: • As of 4 weeks after seeding • 10 - 14 days interval |
3 | 5 | 1.5 - 2.5 |
Onion |
3 applications: • As of 4 weeks after seeding • 10 - 14 days interval |
5 | 8 | 2.0 - 3.0 |
| Potato |
3 applications: • As of 3 weeks after planting • 10 - 14 days interval |
4 | 6 | 1.0 - 3.0 |
Olive |
3 - 5 applications: • As of fruit setting • 14 - 21 days interval |
9 | 12 | 2.0 - 3.0 |
Leafy crops |
3 applications: • As of 4 weeks after planting • Until vegetative growth • 10 - 14 days interval |
5 | 8 | 0.5 - 1.0 |
Sugarbeet |
2 - 3 applications: • As of second half of the season • Application interval- 7 - 10 days |
5 | 8 | 2.0 - 3.0 |
Rapeseed |
1 - 2 applications: • As of vegetative growth • Until beginning of flowering |
3 | 6 | 1.0 - 1.5 |
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Compatible with other fertilizers, except Calcium-containing fertilizers. Therefore, a separate fertilizer dissolving tank is required or the fertilizers must be applied at different times.
Fertilizing Knowledge
GreenSwitch® Potassium
GreenSwitch® Potassium is a fossil fuel-free production process, up-cycling residues from electric car batteries and the paper and pulp industry. The final product is GreenSwitch® Potassium Sulphate, a premium and fully water-soluble Potassium Sulphate with significantly reduced CO2 emissions suitable for foliar and fertigation applications. Produced in Sweden by our industrial partner CINIS Fertilizer, GreenSwitch® Potassium Sulphate is marketed by Van Iperen International.
