Bodenökologische Wirkungen differenzierter organisch-mineralischer Düngung an vershiedenen Standorten (English shop)

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Within the scope of this study, six different combinations of organic-mineral fertilisation were compared with regard to their effects on soil life under spring barley. The two-year investigations were carried out at three very different sites of the International Organic Nitrogen Long-Term Fertilisation Experiments (IOSDV): under the semi-arid conditions of central Spain (IOSDV Madrid), in the transition zone between oceanic and continental climate in Central Europe (IOSDV Berlin-Dahlem), and under the cool continental conditions of north-eastern Europe (IOSDV Tartu).

Spring barley yield was increased at all sites primarily by mineral fertilisation alone or by combined organic-mineral fertilisation. Comparing the sites, the effect of organic fertilisation decreased from south to north.

In contrast to yield, soil organic matter was influenced more strongly by farmyard manure fertilisation than by mineral fertilisation. At the Madrid and Tartu sites, a combination of straw and green manuring had no effect on humus contents, whereas in Berlin this fertilisation treatment promoted humus to a similar extent as farmyard manure fertilisation. Comparing the sites, soil carbon contents decreased from north to south, which is primarily attributable to the climatic differences. Of the soil chemical parameters investigated, hot-water-soluble carbon reflected the effect of organic-mineral fertilisation most clearly.

The population densities of soil microarthropods were promoted at the Berlin-Dahlem and Madrid sites above all by the combined straw and green manuring. Evidently the animals benefited more from the annual input of undecomposed plant residues than from the farmyard manure fertilisation applied only once per crop rotation. Mineral nitrogen fertilisation tended to have a promoting influence on the population densities of soil microarthropods at all three sites. This effect is based on the greater production of plant biomass in the treatments fertilised with mineral N, which provides a food basis for the decomposer community.