One unintended consequence of nitrogen use
in agriculture is an increase in nitrate content in ground waters.
Nitrogen content was evaluated in soil samples from specific
hydrographic regions of Poland from the 60-90 cm soil layer, in
which this nutrient is not readily available to the main root mass
of crop plants and may negatively affect the environment. It was
revealed that Nmin content in specific hydrographic regions was
highly dependent on both the soil type and land use. Notably
higher values of Nmin content were observed for organic soils.
The highest N contents were found in the grasslands of the northwestern
area of Poland, while they were slightly lower in several
regions of the main Odra River catchment and west of the Vistula
River. The area with a high Nmin content in soils under maize was
significantly larger compared to the grasslands area and primarily
included the hydrographic regions of the Odra River basin in its
south-western stretch, and of the Vistula River on its western and
south-eastern side. With regard to the arable land under mixed
cereals, the soils with the highest Nmin content in the non-root layer
were predominantly located in hydrographic regions belonging
to the main Odra catchment and to the catchment of the Vistula
River in its upper course.
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