The Vital Role of Soil Diversity for Sustainable Agriculture

The smell of wet earth is unmistakable and awakens something in all human beings. But why do we like this smell so much? Probably because it is more than a perfume: it is the scent of "active" soils, with organic matter, fertile and full of life. This smell, the smell of biologically healthy soil, is the result of geosmin, a compound produced by certain bacteria. Even with our limited olfactory sensitivity, we would be able to perceive its aroma if a single spoonful of geosmin were dissolved in 200 Olympic-size...

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