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. It is produced by our Swedish industrial partner, CINIS Fertilizer. GreenSwitch® SOP is a highly pure Potassium fertilizer, which dissolves rapidly and completely. Like conventional water-soluble SOP, GreenSwitch® SOP can be used in any fertilization program for high-tech greenhouse and open field fertigation as well as for foliar application. Our product is not sensitive to caking and is recommended during fruit or tuber development, up until maturation, and during the coloring of fruits. The high Potassium level in our formula plays an essential role in achieving higher-quality yields. Growers using GreenSwitch® products reduce their Carbon Footprint and bring waste back to life. With GreenSwitch® Potassium Sulphate, growers make the switch to sustainable high-tech agriculture. GreenSwitch® Potassium Sulphate, another step in our Green Switch Journey!
- 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 |
|---|---|---|---|
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)) |
|---|---|---|---|---|
| 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 |
Fruit trees |
3 - 5 applications: • As of fruit setting • 14 - 21 days interval |
7 | 10 | 1.0 - 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.
