NPK 4-12-20


NPK 4-12-20

amofoska® NPK 4-12-20 with its quantitative ratio of phosphorus to potassium, it qualifies for pre-sowing application under spring and winter cereals. Due to the sulfur content it is recommended to use it for the cultivation of rapeseed, legumes, grassland and in the cultivation of vegetables in fruit-growing.

The best results are obtained by using amofoska® NPK 4-12-20 on soils poor in potassium (light and medium soils) and in conditions of low organic fertilization, as well as in the cultivation of potassophilic plants such as: corn, beets, potatoes.

amofoska® NPK 4-12-20 is a granular, multi-component NPK fertilizer with the following nutrient content.


  • 4% N ammonium nitrogen (total),
  • 12% P2ABOUT5 phosphorus pentoxide soluble in mineral acids (total); at least 5% P2ABOUT5phosphorus pentoxide soluble in neutral ammonium citrate and water, 7% P2ABOUT5 phosphorus pentoxide soluble only in mineral acids, at least 2.5% P2ABOUT5  phosphorus pentoxide soluble in water,
  • 20% K2For potassium oxide soluble in water,
  • 5% CaO calcium oxide soluble in water,
  • 12% SO3 sulfur trioxide soluble in water.

Micronutrients (Co, Cu, Fe, Mn, Mo, Zn) derived from natural phosphates are a valuable addition to the fertilizer improving the bioavailability of other ingredients. According to the current criteria, this fertilizer does not contain harmful amounts of heavy metals such as arsenic, cadmium, lead and mercury, so it is safe for the environment. High quality of granules, i.e. uniform grain size, uniform composition of each granule facilitates uniform sowing. Sulfur in easily digestible form is a valuable nutrient for sulfur-bearing plants, especially recommended for use on soils with low sulfur content.

amofoska® NPK 4-12-20  is a typical pre-sowing fertilizer. After spreading the soil, it is necessary to mix the fertilizer with the soil. Sowing of seeds can be started after 5-7 days from the date of mixing the fertilizer with the soil. The green manure should be spread in early spring. This fertilizer is suitable for all soils, regardless of their compactness and degree of acidity.

The main component of this fertilizer is potassium, therefore the dose should be determined according to the demand of fertilized plants for this ingredient and according to the potassium content available in the soil. The proportion of phosphorus to potassium ensures sufficient phosphorus fertilization of all plants if the correct potassium dose is used. In most cases, however, supplemental nitrogen fertilization, preferably urea or ammonium nitrate of Puławy will be necessary.

Fertilized plantsDose *
Corn for grain and silage200 – 450
Winter rape100 – 300
Spring rape100 – 300
Fodder cabbage100 – 200
Winter and spring cereals200 – 450
White beet200 – 450
Edible potatoes100 – 200
Clover with grasses100 – 250
pasture150 – 300
Grasslands100 – 300

* The doses given in the table are approximate and should be modified depending on the expected yield.

The doses given in the table are approximate and should be modified depending on the expected yield. Nitrogen contained in the fertilizer is sufficient only for the first period of plant growth, then it is necessary to supplement this component by topical application of nitrogen fertilizers according to the needs of cultivated plants.