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input of organic fertilizer in the sandy soil has an effect on SOM quality
comparable with that in the loamy soil. Consequently, the composition
of the extracted SOM depends on the type of fertilization and is here
independent of the texture. However, the differences between fertilizer
treatments in the pyrophosphate and hot water extracts were relatively
smaller in the loamy soil compared with the sandy soils. The higher
clay content in the loamy soil may protect hot water-extractable SOM
against mineralization and sodium pyrophosphate-extractable SOM against
extraction. The results also suggest that for soils with higher clay contents,
improved SOM extraction methods are required.
Acknowledgements
This study was supported financially by the German Federal Ministry of
Agriculture and the Brandenburg State Ministry of Food, Agriculture and
Forestry. We thank Professor Dr Körschens (UfZ Halle Leipzig) for the
gifts of soil samples and helpful discussions, and Mrs Mäder and Mr Rath
for analysing the CEC and SOM composition.
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