posted 10 years ago
Hi Lorenzo,
Just a thought about wood from vineyards: copper.
Copper sulfate (Bordaux mixture, verderame) is a widely used fungicide in vineyards, and copper build up in the soil is a well known problem. In Italy a certified organic vineyard can use up to 6 kg of pure copper sulphate per hectar\year. Non-organic vineyards can use up to 38 kg of pure copper sulphate per hectar\year. In the best case a 30 years old vineyard has been sprayed with 180 kg of copper per hectar.
I do not know how much copper is absorbed by the wood, but I would expect more than traces. Of course you don't want neither a fungicide of any kind at the core of your hugelkultur nor copper pollution in your yard.
I am not an expert, but I would not use it.
Thanks for your praise in my last post.
Going to spray some copper on my tomatoes... bye