Johnny wrote:
I have several raised gardens and will be planting soon. My question
is, should i till the fertilizer into the soil so that it impregnates
the entire 11 inch depth of the soil or is it best to layer the
fertilizer on the surface and mix it with just the top layer of soil
and allow it to gradually work its way down into the lower soil as
the garden is being watered.

Depends what you're planting... many vegetable seeds don't need
fertilizer until after they germinate and develop their true leaves.
And with fertilizer less is more, many people over fertilize and burn
their plants.