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Amofoska 4-12-20 with its quantitative phosphorus to potassium ratio, qualifies for use for pre-sowing of spring and winter crops. Due to the sulphur contained in the fertilizer it is recommended to use it for oilseed rape, legumes, pasture and vegetable crops in horticulture.

The best results are obtained by using Amofoska 4-12-20 on soils poor in potassium (light and medium soil) and in conditions of low organic fertilization and cultivation of potassium-loving plants i.e. corn, beets and potatoes.


AMOFOSKA  4-12-20  AMOFOSKA 4-12-20 is compound granular NPK fertilizer of the following nutrient content:


  • 4% N total nitrogen in the ammonium form,
  • 12% P2O5 phosphorus pentoxide soluble in mineral acids: at least: 5% P2O5 phosphorus pentoxide soluble in neutral ammonium citrate and water, 2.5% P2O5 water-soluble phosphorus pentoxide,
  • 20% K2O water-soluble potassium oxide,
  • 5% CaO water-soluble calcium oxide,
  • 12% SO3 sulphur trioxide in the form of water-soluble sulphates.

Micronutrients (Co, Cu, Fe, Mn, Mo, Zn) derived from natural phosphate rock are a valuable addition fertilizer improving bioavailability of other ingredients. Under normal conditions this fertilizer does not contain harmful levels of heavy metals such as arsenic, cadmium, lead or mercury, so it is safe for the environment. The high quality of granules i.e. the uniform size of grains, homogeneous composition of each granule and the lack of dust facilitates uniform sowing. Sulphur in an easily-assimilable form is a valuable nutrient for sulphur-loving plants; especially recommended for use on soils with low sulphur content.


Amofoska  NPK Mg  4-12-20 is a typical pre-sowing fertilizer. After dispersing on the ploughed land it needs to be mixed with soil. Seed sowing can be done after 5-7 days from mixing the fertilizer with the soil. This fertilizer should be dispersed on green crops in early spring. It is suitable for every soil, irrespective of its compactness and degree of acidification.


The main component of this fertilizer is potassium, so doses should be determined according to the need of the fertilized plants regarding potassium and the content of assimilable potassium in the soil. The phosphorus-potassium ratio provides sufficient phosphorus fertilization of all plants, provided the correct dose of potassium is applied. In most cases it will be necessary to provide supplementary fertilization with nitrogen, preferably with urea or ammonium nitrate 'Puławy'.

Fertilized plants Dose *
Corn for grain and silage 200 - 450
Winter rape 100 - 300
Spring rape 100 - 300
Fodder cabbage 100 - 200
Winter and spring crops 200 - 450
Sugar beet 200 - 450
Early potatoes 100 - 200
Clover with grass 100 - 250
Pasture 150 - 300
Green crops 100 - 300

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

The doses given in the table are indicative and should be adjusted depending on the expected yield. Nitrogen in the fertilizer is sufficient only for the first period of plant growth, then this component needs to be supplemented by stock use of nitrogen fertilizers according to the needs of cultivated crops.