Differences in soil sulfur fractions due to limitation of atmospheric deposition
2009
Balik, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Kulhanek, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Cerny, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Szakova, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Pavlikova, D.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Cermak, P.,Ustredni Kontrolni a Zkusebni Ustav Zemedelsky, Brno (Czech Republic)
The aim of this work was to estimate the changes in contents of different sulfur fractions in soils under conditions of lowering inputs of S from emissions together with the influence of application of manure and mineral fertilizers. Soil samples from long-term field experiments were used for this purpose. The samples were taken from 10 sites from precise long-term field experiments with different soil-climatic conditions in the Czech Republic. The samples were analyzed using the following fractionation: (i) water soluble S (H2O extracts), (ii) sorbed S (0.032M NaH2PO4 extracts) and (iii) S occluded with carbonates (1M HCl extract). Furthermore, the concentration of total S (Stot) and organic S (Sorg) was determined. Soil samples were taken in the years 1981 and 2007. During 26 years a decrease of Stot by about 3-8%, water soluble S by 65-68% and sorbed S by 39-44% were observed in the topsoil of the evaluated soils. Furthermore, a low increase in the content of organic S was observed. The estimated ratio of Sorg reached 78.7-80.9% from Stot in 1981 and 87.7-89.8% in 2007. Farmyard manure (40 t/ha) applied every 4 years did not have a significant influence on S fractions and Stot contents in soils; intensive S fertilizing increased Stot and mobile S forms contents in soils. Very close correlations were obtained especially between Stot and water soluble S and organic S.
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