Folex K

An inorganic emulsion containing potassium and nitrogen.

A wide range of crops including cereals, potatoes, maize, leafy salads and horticultural crops.

To correct nutrient deficiency. Also to promote potato bulking, promote fruit set and quality and as a hardener for protected over wintered crops.

Pack Sizes
10, 1000 litres

Analysis w/w w/v
Nitrogen (N) 7.6% 11.0%
Potassium (K2O) 26.7% 39.0%


Function of Potassium
Potassium (generally referred to as potash) is a major nutrient which is required by all crops. It is second only to nitrogen in the amounts required by the crop. It is highly mobile and is quickly distributed within the plant.

Low levels of potassium will seriously affect crop growth, quality and yield. Folex K is a unique formulation which includes nitrogen in addition to a high concentration of potassium. The balanced formulation will ensure optimum uptake of the nutrients in situations where it is required.


Potassium Deficiency
Potassium deficiency affects a wide range of arable and horticultural crops. The visual symptoms of potassium deficiency are usually seen in crops on light sandy soils or chalk soils.

More common however is a reduction in plant size due to reduced potassium uptake. The visual symptoms of extreme deficiency are seen first on the older leaves. Most crops exhibit a yellowing of leaf margins which extends to the midrib as the deficiency becomes more severe. This eventually results in leaf necrosis, particularly at the margins.


Use Folex K when potash deficiency is diagnosed or suspected, or as part of a nutrient management programme on potatoes. Foliar uptake will be enhanced by the addition of NA13¹ unless already in tank mix with a pesticide.

Apply 2-5 l/ha, in a minimum of 200 l/ha water.

The spray tank should be filled with half the required water. After shaking the container, measure the required amount of Folex K and add to the tank whilst maintaining constant agitation. Add remaining water to correct dilution and spray.


Do not apply in tank mix with pesticides when crop is showing deficiency symptoms, is under stress, or in adverse weather conditions.

1 NA13 is an adjuvant designed to help with improved adhesion, deposition and penetration of the spray solution on the leaf surface. NA13 should be added at 0.1% of the spray volume, e.g. 100 ml in 100 litres of water. Maintain agitation and apply immediately after mixing.



Use Folex K when potash deficiency is diagnosed or suspected, or as part of a nutrient management programme on soft and tree fruit.

For more information on timing and application rates, please refer to the Folex K Technical Information for Horticulture PDF.

Turf and Amenity

Folex K is a super concentrated potassium and nitrogen feed.

Potassium is a major nutrient which is required by all plants. It is second only to nitrogen in the amounts required by turf. It is highly mobile and is moves freely in sandy rootzones.

Within the turf, potassium is involved in over 60 plant enzyme processes and other biochemical reactions including the production of sugars and starches. Potassium helps build turf by strengthening cell walls, increasing winter hardiness and drought resistance. As approximately 60% of stored potassium can be removed in any one mowing and many sand greens are incapable of retaining soil-applied potassium, it is important that regular potassium application is maintained.

The main role of potash within the plant is as a water regulator and in this role it influences many plant processes. It is particularly important in the regulation of cell water content, cell turgidity and is therefore important to maintain a healthy, hardwearing sward. The movements of sugars from the leaves to the roots also depend on potassium.

When to use How much to use Comments
Throughout the year 0.25 litres/green, 5 litres/ha Repeat every 2-3 weeks


HORTICULTURE - foliar products for horticulture

AMENITY - foliar products for turf and amenity





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