Suppose I wanted to compress something like Milorganite into a shape that could survive being stuck into the ground.  Is there any way to go about doing this on a small without the use of industrial equipment or specialty machines?  The material doesn't have to be Milorganite but could be a low-nutrient fertilizer.  

Any ideas on how I might go about this?  Can it even be done?  Search engines lead me nowhere.

Wouldn't compressing it into a small, dense, and impenetrable mass prevent it from accomplishing its purpose?

How deep do you want to stick the fertilizer into the ground?  If it is less than a foot, you could take a wood stakes, drill a hole down the length of each, fill with the fertilizer, and drive it down.   The wood will rot away over time allowing the fertilizer to get into the soil. Plus the rotting wood would add bio material as well.

Once water hits it, I'd imagine it would dissolve.  At least that's the plan.