Potassium Sulphate (SOP) Horticultural Grade

Hydroponics

Mentioned concentrations represents the amount of nutrients in the stock solution. The final concentration in the irrigation water depends on the amount of nutrients in the stock solution, the injection ratio and the amount of nutrients used in the water.

Fertigation

Crop	Application date	Min kg/ha/season	Max kg/ha/season
Fruit trees	• As of fruit setting • Until 4 weeks before harvesting	150	350
Banana	• As of plant establishment • During entire fertigation program	300	500
Citrus (adult)	• As of fruit setting • Until 4 weeks before harvesting	200	400
Potato	• As of tuber setting • Until tuber filling	100	200
Vineyards (adult)	• As of flower bud opening • Until 4 weeks before harvesting	100	250
Pistachio	• As of vegetative growth • Until fruit filling	170	300
Fruit bearing vegetables	• As of vegetative growth • Until 4 weeks before harvesting	100	300
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
Citrus	3 - 5 applications: • As of fruit setting • 14 - 21 days interval	9	12	2.0 - 3.0
Olive	3 - 5 applications: • As of fruit setting • 14 - 21 days interval	9	12	2.0 - 3.0
Potato	3 applications: • As of 3 weeks after planting • 10 - 14 days interval	4	6	1.0 - 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 • 7 - 10 days interval	5	8	2.0 - 3.0
Table grape	3 - 5 applications: • As of fruit setting • 14 - 21 days interval	7	10	1.5 - 2.0
Fruit bearing vegetables	1 - 3 applications: • During vegetative growth • As of fruit setting • 10 - 14 days interval	5	8	0.5 - 1.0
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
Rapeseed	1 - 2 applications: • As of vegetative growth • Until beginning of flowering	3	6	1.0 - 1.5

In case of foliar feeding as part of a mix with crop protection products, a compatibility test has to be done prior to preparing the spray-mix.

The mentioned indicated dosages and application stages are given as a guideline. Exact dosages, concentration and application stage are subject to local conditions, use of other fertilizers and can only be given after an objective diagnosis.