I knew it was a long-shot when I started this thread. That a simple answer could be given is a fantasy. It's clearly a multi-variant situation with confounding factors... I know I'm confounded. I'll try to keep my eyes peeled and see if I can spot any trends. I'm also kind of interested in soil mineral content. I think I may experiment with Calcium, Magnesium and Phosphorous. Maybe some seaweed meal which contains many trace minerals. Who knows what might turn up.
