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The
cycle of life concept played an especially fundamental
role in sciences related to forestry and environentalism.
Knowledge of "humus" changed from "a
black substance perhaps necessary to plant growth"
in the 18th century, to being the medium in which
microbes broke down the accumulated dead vegetable
material making it available for the next generation
of living organisms. The founders of organic farming
applied this natural process in their reform of
agricultural practices in the mid 20th century. |
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In several
posters find the follwing items: |
Justus
Liebig, Agricultural textbook, 1845 |
Jean
Baptiste Bouusingault, Economie rurale, 1849 |
John
Pitkin Norton, Agricultural report, 1842 |
William
Henry Brewer, Up the California Coast, 1868 |
Selman
Waksman, Humus, 1939 |
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