We bought a house with a garden. Irrigation system in, but I will be making
some changes.

The soil locally is blow sand from red sandstone. A friend of mine gave me
a big tiller for doing some work to help him clean up after a fire. I got
it all cleaned up and put new gas in it, and it fired right up. So, I took
it on a couple of rows of the garden.

The soil is light and fluffy and not rocky as the adjoining soil.
Apparently the previous owners had put a lot of organic material in there.
It's really nice looking soil.

Is there some simple tests that I can do to see what's sand and what isn't?
Say, put some in a bucket and see how much floats vs. how much sinks?

Should I go buy some garden soil (I already have five big bags) and till
that in, too? Should I till in some general fertilizer for the whole
garden?

What would be some good things to do now that I have a blank palette, and
don't have to redo what someone else has done?

Steve