(in lingua inglese)
Mineral fertilizers used in tests (urea, ammonium sulfate, nitrochalk) differed significantly, bulk density, mass density and size grading. The ammonium sulfate contained up to 52.50% of powdery fractions. The specified value is more than 1.7 thousand times greater in comparison with the content of nitrochalk powdery fractions. The content of powdery fraction in urea was 10.35%. The highest bulk density (1.029 kg·dm-3) and mass density (1.800 kg·dm-3) was observed for nitochalk. The smallest density was observed for urea, which represented approximately 74% of nitochalk density (comparison within the same category). Bulk density and mass density of ammonium sulfate accounted for around 99% of the density of nitrochalk.