Thanks Bobert. We didn't add any phosphate. We put in a mixture of organic manure and humus, clean potting soil, sphagnum moss, and some kind of humus mixture that was supposed to be good for mushrooms. The guy at the store said it was good for other things besides mushrooms as well. Do you think it could have been any of those things that had too much phosphate? Would the potash and nitrogen help to fix the problem of too much phosphate?