In this study, urease, protease, acid phosphatase and dehydrogenase
are chosen to study the effect of leonardite on soil enzymes’ activity. The
enzymes in question originated from plant roots and microorganisms.
They are accumulated in soil as extracellular enzymes. Their activities
reflect the patterns of soil organic nitrogen, carbon, phosphorus accumulation
and decomposition. Urease catalyzes urea's hydrolysis into
ammonia or ammonium ion. Phosphatase plays an important role in
transforming organic phosphorus into inorganic form,which is suitable
for plant uptake. Soil dehydrogenases are nonspecific and measure
oxidative reactions in soil, whereas proteases play an important role
in mineralization of soil nitrogen. The objective of the present work is
to study the effect of humic substances (used in different leonardite
doses) on chosen morphological features and yielding of arnica on
sandy soil as well as changes in enzymatic activity and basic chemical
soil's properties.