Sulfur balance in soils based on the results of long-term field experiments | Bilance síry v půdách na základě využití výsledků z dlouhodobých pokusů
2012
Kulhánek, M., Česká zemědělská univerzita, Praha (Czech Republic). Fakulta agrobiologie, potravinových a přírodních zdrojů, Katedra environmentální chemie a výživy rostlin | Černý, J. | Balík, J. | Vašák, F. | Shejbalová, Š.
Sulfur deficiency in plant nutrition is an actual problem in the Czech Republic and in other European states. Agricultural and horticultural crops are more susceptible to the sulfur deficiency. The samples were taken from 10 sites from precise long-term field experiments with different soil-climatic conditions in the Czech Republic. Soil samples were taken in the years 1981 and 2007. The samples were analyzed using the following fractionation: i) water soluble S - S sub(H2O) (H2O extracts), ii) sorbed S - S sub(ads)(0.032M NaH2PO4 extracts) and iii) S occluded with carbonates - S sub(okl)(1M HCl extract). Furthermore, the concentration of total S, organic S and total organic carbon was determined. The content of S sub(H2O), S sub(ads) and S sub(okl) in soil significantly decreased from the year 1981 to the year 2007. The content of total and organic carbon did not significantly changed and C:S ratio was in average 56:1 in the year 1981 and 59:1 in the year 2007. Integration of inorganic and organic fertilizer inputs and the equitable re-distribution of S from fertilizers are discussed. The paper concludes by highlighting a need targeted to practical approaches for reducing S losses, and improving the overall synchrony between supply and demand.
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