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註釋The enhancement of soil fertility was a crucial value already to the pioneers of organic farming, but the conservation of fertile soil is not always given enough attention. And yet organic farming depends on good natural soil fertility. Exhausted and damaged soils cannot offer the desired performance. The cultivation of soil fertility requires a lot of care. This booklet offers a view on soil fertility from different angles. It deliberately avoids offering universal 'instructions', but rather seeks to provide information to stimulate new thinking about a sustainable relationship to the soil.