Soil’s Organic and Inorganic Forms of Nitrogen and the Properties of Humic Substances as the Result of Long-Term 1 Tillage Intensity

Lech Wojciech Szajdak, Teresa Meysner, Teodor Rusu, Marek Szczepanski


The study was carried out to evaluate the impact of three farming systems (ecological, integrated and integrated)
on the content of different forms of nitrogen and biologically active substances in soils. The farming systems significantly
impacted on the the transformation of the total nitrogen, concentration of ammonium, nitrates, urease activity, organic
carbon, bounded amino acids, as well as the total amount of free phenolic acids and pH values in soils. The highest
concentration of total nitrogen, organic carbon and urease activity was determined in soil of ecological system. The
conventional system impacted on the highest contents of ammonium, nitrates and total amount of bounded amino acids.
The highest concentration of free phenolic acids was measured in soils of integrated system. The pH ranged from 5.0 to
6.2. The lowest pH was shown in soils of integrated and the highest of ecological system. Similar C/N ratios observed in
all farming systems.


otal nitrogen and organic carbon, ammonium and nitrate, bounded amino acids, phenolic acids, urease activity, farming systems.

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