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a couple links for calcium peroxide: http://push2buy.net/stores/fearless_rolodex/docs/AgriGrowth/Calcium%20Peroxide.PDF (this is the stuff I used to sell to hydroponic stores and garden centers) http://en.wikipedia.org/wiki/Calcium_peroxide

try moving the soil away from the trunk and see how far you get till the trunk flare meets the first roots, pretty non invasive start to see if there is an obvious problem. Maybe a soil core sampler but someone mentioned sandy soil which is tough to get a good core from. is there auto...