Not a normally recommended forest clearing method

When the Portuguese landed in Madeira off the African coast in 1420 they began to clear the woods and they set a fire that lasted seven years. The potash left over was the perfect fertilizer for the grapes imported from Create and the result was the famous ‘Madeira’ wine.

(Book – The Discoverers : A History of Man’s Search to Know His World and Himself – Daniel J. Boorstin)

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