Buddy, this is what I use,this makes 200 lbs.
buy 1 50lbbag calcium phosphate
1 50lb bag stock salt (ice creme salt)
2 50lb bags loose red mineral salt
Get a large coffee can and mix 2 parts red mineral salt, 1 part calcium phospate and 1 part stock salt.
Do not mix till you get ready to use it will set up.
Dig up a 3 foot circle about 6 inches deep and mix in with soil, refreshen in 6 months and once a year after that.

I put about 20 lb. to a circle and put it out in April. I bought it all at Southern States for around $30.00.

Hope this helps Martin