I need to add sulfur, zinc, calcium, and phosphourus according to my soil sample.Other than that my PH is perfect.I am in zone 7 and have clumpy clay soil that is getting better since I added a lot of leaf compost to it.I am considering Gypsum (heard it works, then again heard it's not effective on heavy clay soils)Rock Phosphate (heard it can contain heavy metals)Super Phosphate (heard it wasn't considered organic)Bone Meal (seems to be ok, yet it's an animal product)Pearlite/VermiculiteOr just maybe garden tone or something like that.
Allot of people use it with seemingly no problem. I don't like the stuff. Do a search for vermiculite asbestos, or cancer. I use one of the beddings made from coconut coir, like bed a best or eco earth.
