Potassium Sulphate (SOP)

Application

Agronomical target

Nutrition

Certifications

Van Iperen Potassium Sulphate (SOP) Horticultural Grade is a highly pure Potassium fertilizer, which dissolves rapidly and completely. Our product is not sensitive to caking and is recommended during fruit or tuber development and up until maturation, and during coloring of fruits. The high level of Potassium in our formula plays an essential role in achieving higher quality yields.

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

Application

Agronomical target

Nutrition

Certifications

Application

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

Leaflet Product leaflet

TDS Technical Datasheet

MSDS Material Safety Datasheet

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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.