As there have been multiple threads dealing with using no till for overseeding grass hay, thought I would post my results in multiple scenarios from 2015 and 2016.
Scenario 1. New og seeding in teff stubble. Seeded Aug 22, 2015. unfortunately, the spray job to kill the teff was a failure. So the areas where the teff died from lodging (was dead when planting og) germination was fine, where the teff was vigorous no germination or establishment and thus the need for overseeding those areas in early 2016. Photos:
Scenario 2. Overseeding og in established og to thicken stand. overseeding was done 8-23-15.
Scenario 3. Overseeding KY31 fescue in paddocks. 
The image at the bottom is mislabeled, it is KY31 fescue overseeded in paddock. sorry, could not edit at this point.
All the overseeding worked well and I am pleased with the stands obtained. The drill is a GP 1007NT and seeding rates were 22-25# og, and 50# KY31. I did not put a pic of the timothy experience as there was nothing to show-I think it was just planted too deep. The og and fescue were planted deep as well but that worked out as that helped survive a dry spell in the fall seedings and a cold spell in the spring seedings, depth delaying emergence in spring avoiding 22 degree nights on the new seedlings and a dry top 1/2 inch in fall.
Attached Thumbnails
seeding and overseeding No till
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