Original scientific paper
NITRATE NITROGEN IN THE SOILS OF EASTERN POLAND AS INFLUENCED BY TYPE OF CROP, NITROGEN FERTILISATION AND VARIOUS ORGANIC FERTILISERS
2011, 12 (2) p. 367-379
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.