LOL...yeah, that info would help, wouldn't it?? [&:]

Don't use all 150 pounds in one spot obviously. Either make several, or save the leftovers for freshening it up later in the year. Yes, dig it up so you have a good bit of loose soil. Then, dump your minerals on the dirt and use a shovel to mix it all up. Just mix it up right w/ the dirt.

We have 3 of these at our farm that we made in April. They already are just big holes in the ground. Already had to freshen them up.