Just for grins and giggles, here's a pic of the "furrow hoe" I had a friend make me from a piece of pipe welded to a tiller furrow attachment. The attachment belonged to an old Troy-bilt tiller I no longer have and it's replacement didn't come with attachments.
This thing will drag a 5-6" deep furrow so I can lay fertilizer under the corn rows, pull about 3" of soil over it with a hoe and then plant the corn. It's not quite balanced right but it gets the job done.