Serbian and French researchers have reported that the Belgrade Fortress, which was first built in the early Middle Ages is under threat – not only by the effects of coal burning, as was assumed until now, but also by flower beds! The deterioration of the fortress walls could be partially caused by the large quantities of potassium present in fertilizers used by gardeners and could be responsible for the formation of black crusts on the ramparts.
To preserve this heritage, the researchers recommend avoiding excessive use of fertilizers. Their conclusions are due to be published in the first quarter of 2012 in the Journal of Cultural Heritage and could prove to be of value to other historical sites across the world.
Click here to read this article from Medievalists.net
