The majority of arable land of central Slovenia is characterised by shallow brown soil - Hapludoll (Mollisol) and a humid (1400 mm precipitation a-1), temperate climate (8,3°C long-term yearly average temperature). Farmyard manure (FYM) is regularly used for field crops; however, not much is known about the nutritional value of FYM, especially regarding nitrogen in this specific condition. Therefore, the dynamics of mineral as well as soluble organic N derived from soil and FYM was studied in the area (46°N, 14°E, 370-380 m a.s.l.).