INFLUENCE OF LONG-TERM SPRINKLING IRRIGATION AND NITROGEN FERTILISATION ON SOIL NITROGEN CONTENT OF A CEREAL CROP ROTATION

The paper presents results of investigations on the proportion contents of different nitrogen forms in the soil in conditions of a long-term cereal crop rotation. The experimental factors included sprinkling irrigation and nitrogen applied at various doses. It was found, among others, that the sprinkling irrigation failed to influence the content of the examined nitrogen forms in contrast to the nitrogen impact whose effect was statistically significant. A synergistic influence of both factors became apparent only in the case of the content of easily-hydrolysable nitrogen (N-EH).