I don't know if I have the funds to get it lab tested for the moment, but I will definitely be doing all the home tests that I can (phos, pH, trace minerals)
I created a spread sheet that balances NPK's in a soil recipe based on the "percent available" of each ingredient as compared to the end-total volume. I don't like to brag, but I'm quite proud of it. lol. I'm having trouble figuring out what actual percentages are normally in the standard brand name organic potting soils (FF, Roots, mendo, ect). I basically just have it narrowed down to a ratio between the three macro nutrients, which is why I decided to go light on the ingredients with npk's to start off. I can always supplement nutrients, but I can't take them back out of the soil!
I chose the proportions for this bloom recipe based off of my take from several different "one part" bloom nutrient lines and the one "bloom" potting soil that I could find npk's on. I can't remember which one anymore.
Basically, someone dropped a couple storage bins worth of organic amendments on me a couple years ago and I want to do something with them, but I can't find a soil recipe that incorporates enough of these exact ingredients that I have. I would just end up having to go out and buy a whole second arsenal of amendments which would leave me with even more of them than when I started. And I would have only used 1/3-1/2 of the original ingredients that I'm trying to get rid of in the first place. anyway, rambling. Thanks again for taking the time to help me with this! Much appreciated.
EDIT: The lady at the feed store looked at me like I was crazy when I told her that I was going to add the oyster shells to some soil.