摘要 : The study was focused on the incorporation of the determination of sulphur into the regular soil testing scheme which is based on Mehlich III extraction method. Extraction of finely ground soil (particles < 0.250 mm) with water ac... 展开 The study was focused on the incorporation of the determination of sulphur into the regular soil testing scheme which is based on Mehlich III extraction method. Extraction of finely ground soil (particles < 0.250 mm) with water according to ISO 11048 was the most frequently used method for the determination of sulphur. The influence of soil particle size for water extraction and Mehlich III extraction, the relationship between sulphate sulphur and total sulphur in water soil extracts and relationships between water, Mehlich III and aqua regia soil extracts were studied. 147 soil samples collected from the soil monitoring plots were used for the evaluation of the relationships between the extraction methods (water extraction, Mehlich III and aqua regia) and between sulphate sulphur and total extracted sulphur. 29 topsoil and 29 subsoil samples from the South-Moravian region were used for evaluation of the influence of soil particle size on extraction of sulphur. The increase of sulphur extractionfor finely ground samples (< 0.250 mm) for water and Mehlich III extracts was only 4-6% (R2 = 0.98) compared to ordinary prepared soil samples (<2 mm). A linear relationship (R2 = 0.91) between the sulphate sulphur and the total sulphur extracted by water was found. Extracted sulphate sulphur was determined by capillary zone electrophoresis and total extracted sulphur by ICP-AES. Approximately 70% of the total extracted sulphur was present as sulphate sulphur. A highly significant linear relationship was found (R2 = 0.62) between water extraction and Mehlich III extraction. Conversion equations may be used for recalculation of criteria but field and pot experiments will be necessary to establish a more precise relationship between determination of sulphur in Mehlich III soil extracts and the plant uptake. No relationship was found between content of sulphur in aqua regia extracts and the other studied extraction methods. 收起