I covered my buckwheat, oats, winter wheat, and soybeans with the "disk" harrow. Reducing the depth to 2" will bury the seed about 1" if the soil is disked fine enough. A "spring tooth" harrow might work if that is all you had. The "spike tooth" harrow I use for leveling behind the "disk" harrow. For the fine seed like clovers, trefoils, brassicas I don't bury or rake them. Their seed is so small they work themselves into cracks in the soil or rain pushed them into the soil. When a cultipacker is available you can use that to press the seed against the soil.