Where did the standard of soil fertility stored in Paris come from? Detailed answer

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Where did the standard of soil fertility stored in Paris come from? Detailed answer

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Where did the standard of soil fertility stored in Paris come from?

In 1900, the Russian naturalist V.V. Dokuchaev sent a cube (1x1x1 meter) of chernozem carved from the feather grass steppe near Voronezh to the World Exhibition in Paris.

The Voronezh black soil became one of the main exhibits of the exhibition, received a gold medal and was recognized as the "king of soils". Subsequently, it was identified as a standard of soil fertility and placed in the International Chamber of Weights and Measures in Paris, where it is still kept.

The content of humus (a complex of high-molecular organic substances containing the main elements of plant nutrition) in this soil reaches 14-16 percent.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What are the top ten lakes in the world in terms of water surface area?

The ten largest lakes in the world are the following (numbers indicate the mirror area in square kilometers): the Caspian Sea (Europe and Asia, 396), Superior (North America, 000), Victoria (East Africa, 82), Huron (North America, 413), Michigan (North America, 68), Aral Sea (Central Asia, 800), Tanganyika (East Africa, 60), Big Bear (North America, 700), Baikal (Siberia, 58) ) and Nyasa (East Africa, 020).

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