Terra preta

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One of the best soils for greenhouses is Terra Preta. It is black and is created from anorganic matter (sand, clay, regolith, or traditionally, pottery sherds), organic waste (feces, bones, rotten leaves, etc.) and charcoal.

Terra preta is full of microbial life, can hold large amounts of water and supports plant growth with lots of nutrients.

External links

Deutschland Radio: Joghurtkulturen im Campingklo (German)