Jeff,
That's a nice looking plot, I agree with Scott the soil looks rich. Similar to some that we have here in Illinois.The top few feet in the rural areas are the gold stuff. Closer to the city has a mix of blue and yellow clay. It appears the area to the right slants downward into the patch. Do you get heavy runoff.
One of my sisters has a similar looking area. She has to deal with wet ground into May.
Ton of powder.......I also like to keep mine pure. Salt or other ingredients get mixed separately into any food prep. I learnd many yrs back, once you add certain ingredients, you can't take out. Adding more of something else to cover only makes the dish off balanced.
Thats a teaser looking at seedlings...for me. I won't start until Feburary.........full steam ahead.........or shall I say...electric !