Volcanic Ash
Posted: Tue May 24, 2011 5:42 pm
I suppose it to much to hope that it is good for the Allotment. 
http://en.wikipedia.org/wiki/2010_erupt ... %C3%B6kull
Samples of volcanic ash collected near the eruption showed a silica concentration of 58%—much higher than in the lava flows. The concentration of water-soluble fluoride is one third of the concentration typical in Hekla eruptions, with a mean value of 104 milligrams of fluoride per kilogram of ash. Agriculture is important in this region of Iceland, and farmers near the volcano have been warned not to let their livestock drink from contaminated streams and water sources, as high concentrations of fluoride can have deadly renal and hepatic effects, particularly in sheep.
