Losses of soluble forms of organic carbon in relation to different agro-technical treatment of meadows

DOI:10.17221/46/2015-SWRCitation:Burzyńska I.: (2016): Losses of soluble forms of organic carbon in relation to different agro-technical treatment of meadows. Soil & Water Res., 11: 228-234.
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Studies were performed to determine the loss of soluble forms of organic carbon in differently used meadows on mineral soil. In a long-term experiment two variants were distinguished: a productive meadow (N120-AN and N120-CN) and a non-productive one (Kp-AN, Kp-CN, Kz-AN, Kz-CN). Productive meadows were fertilized with 120 kg N/ha/year, 34.9 kg P/ha/year, and 149.4 kg K/ha/year and mown three times a year. Nitrogen fertilization was applied in a form of ammonium nitrate (AN) and calcium nitrate (CN). The only agro-technical measure applied to non-productive meadows was the regular cutting of vegetation and leaving it on the plots (variants:
Kp-AN and Kp-CN) or taking it away from the plots (variants: Kz-AN, Kz-CN). Significant positive Pearson’s linear correlations were found between pH (in CaCl2) of mineral soil and total organic carbon (TOC) content in the following variants: Kz-AN (r = 0.457**), N120-AN (r = 0.491**), and N120-CN (r = 0.424**) and in all meadows fertilized with AN (r = 0.243**). The obtained linear correlation coefficients between pH and TOC indicate that soil organic carbon may be lost as a result of progressive acidification of the soil. Dissolved organic carbon in the mineral meadow soil increased in the following order: Kp-CN > N120-CN > Kz-CN > N120-AN > Kp-AN > Kz-AN.

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