Effect of organic fertilizers on soil organic carbon and risk trace elements content in soil under permanent grassland

Hana Karabcová, Lubica Pospíšilová, Karel Fiala, Petr Škarpa and Marie Bjelková
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Hana Karabcová: Agrovýzkum Rapotín Ltd., Vikýřovice, Czech Republic
Lubica Pospíšilová: Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Faculty of Agronomy, Mendel University in Brno, Brno, Czech Republic
Karel Fiala: Agrovýzkum Rapotín Ltd., Vikýřovice, Czech Republic
Petr Škarpa: Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Faculty of Agronomy, Mendel University in Brno, Brno, Czech Republic
Marie Bjelková: Agritec Plant Research Ltd., Šumperk, Czech Republic

Soil and Water Research, 2015, vol. 10, issue 4, 228-235

Abstract: The effect of different kinds of organic matter inputs on elemental composition, content, and quality of humic substances was studied on permanent grassland during 2008-2013. The experiment included two organic fertilizer types - compost and slurry, both with the range of stocking rates 0.9, 1.4, and 2.0 livestock units (LU)/ha (corresponding to 54, 84, and 120 kg N/ha, respectively), and control without any fertilizer. The soil was sandy-loam, of Cambisol type, with semi natural permanent grassland. Labile forms and total contents of selected trace elements (Co, Cu, Zn, Cd) and macroelements (Ca, Mg, K, P, and N) were measured. Soil organic matter parameters such as total organic carbon (Cox), humic substances (HS), humic acid (HA), fluvic acid (FA), and labile carbon forms (hot-water extractable carbon (Chws), cold water extractable carbon (Ccws)) were determined. Results showed that the greatest content of P, Ca, Mg, and N in the soil was detected by the CO 2.0 treatment. Furthermore, the positive effect of compost on Cox, Chws, HA, FA, HS, N and macronutrients was observed. The elemental analysis of humic acids showed lower carbon content and higher oxygen content in HA molecule, which indicated young humic acids, with a lower condensation degree. The content and quality of humic substances strongly influenced the total and labile trace elements content in the soil. Additionally, hot water soluble carbon significantly correlated with plant available forms of Zn, Cu, and Cd.

Keywords: compost; labile organic carbon; slurry; trace elements (search for similar items in EconPapers)
Date: 2015
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DOI: 10.17221/5/2015-SWR

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