I get it at Mill's Fleet in Ankeny. About ten dollars a bag. And that soil breakdown analysis you posted........you might as well be speaking Greek. All I know is clover thrives on nitrogen poor areas. And I was having no luck at all using chemicals without wreaking havoc on everything else. So I thought...what the heck. It doesn't grow well in nitrogen rich environments, and the grass will love it......okay. So every spring, I mix the spreader with a 50/50 of weed-n-feed and milorganite. The weed-n-feed has the fast acting and milorganite is slow. And you can spread it all times of the year without adverse affects. The milorganite......not the weed n feed. It was a shot in the dark for me and has worked rather well. Also, in the fall.....I mix the spreader with a 50/50 of milorganite and grass seed for the next spring. So as you can see, very little science involved on my end. But not much cost and the lawn looks great. May not be hosting any PGA tours anytime soon, but I hold my own with the neighbor who spends a butt load for a company to come in and take care of his.