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This paper describes the influence of nitrogen and organic fertilisation and the type of crops on the contents of NO3-N in arable land. The large-scale environmental research was carried out in 2004-2006. Soil samples were taken from 411 places throughout the Lublin region in two seasons: spring and autumn. The concentration of nitrate(V) depended on fertilisation and crops. It was found that application of N-fertiliser above 121 kg N ha-1 caused a significant increase in the nitrate(V) concentration in the surface soil layer. The distribution of NO3-N in the soil profile indicated a possibility of nitrate(V) leaching during winter and early spring. On fields treated with a liquid organic fertilizer, the content of NO3-N was considerably higher than on the other fields. The lowest NO3-N was observed in straw treatments. A higher content of NO3-N was noted in sugar beet and vegetable objects, while fallow, rye or rough grazing decreased accumulation of nitrate(V) in the soil profile

NITRATE NITROGEN IN THE SOILS OF EASTERN POLAND AS INFLUENCED BY TYPE OF CROP, NITROGEN FERTILISATION AND VARIOUS ORGANIC FERTILISERS