Study of the ph variability in permanent meadow soils resulting from nitrogen fertilization and after-effect of liming
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Institute for Land Reclamation and Grassland Farming, Falenty IMUZ, 05-090 Raszyn, Poland
Publication date: 2020-05-27
Acta Agroph. 2000, (35), 153–170
renewed acidification after soil liming (reacidification) related to ammonium nitrate (AN) and calcium nitrate (CN) fertilisation in three long-term grassland experiments (started in 1981) have been performed. The experiments were set up in randomised blocks in 4 repetitions in 1981, and were localised in the Mazowieckie voivodeship. The soils under the experiments differed in their physical and chemical properties. Lime (CaCO3) was used once directly on the sward, at the beginning of the experiments in doses related to hydrolytic acidity levels I Hh and 2 Hh. Two doses of nitrogen (N1 – 120, N2 – 240 kg/ha) in the AN form, and since spring 1992 in CN form were used. Phosphorus and potassium were applied at constant doses. The pHKCl level of each 5 cm soil layer down to 25 cm depth from each fertilising treatment was measured. The recognition of specific dynamic of acidification and reacidification in the separate 5 cm layers, on the background of different soil properties, doses and forms of nitrogen fertilisers can be helpful in characterising the N transformation processes as well as nutrient consumption by the herbage, the roots mass of which is contained mostly in 0-15 cm upper soil layer.