Maybe I'm dense, but it still hasn't come together for me in regard to mineralization. I am considering the 9x12 concentric for a favoured field, when crops allow. I remember ground balancing generally at around 84 in that field. Is this considered moderate or heavy mineralization ? I am wondering if it is worthwhile to get this coil for that field. From what I understand, the DD is good for mineralization while the concentric is for mild or neutral soil. What numbers are neutral soil ? Or am I looking at this all incorrectly ? I really don't know. Any help is appreciated, thanks.