Technical specification Ammonium nitrate is the most common nitrogen fertilizer for feeding all the kinds of crops with total contents of nitrogen 34%. This is the fastest acting granular nitrogen fertilizer appropriate for all the kinds of feeding. Due to its absorbable form after getting into the soil, it rapidly decomposes and provides the plants with nitrogen food. At the absorption of the ammonium nitrate from the soil, its form changes in due time, this process is easily regulated, taking the soil-climatic conditions and the time period of the input of the product into consideration. The investigations made through isotopic methods show that from 35 % to 50 % of the nitrogen input with the fertilizers are usually used by the plants. About 20–30% of the fertilizer nitrogen are immobilized by the soil micrororganisms.