A couple of years ago, I had pondered the idea of drilling some tillage radish's, about every 4' or so, with something similar to a Pasture Dream, or Zip Seeder. then the following year, drill between those rows. After doing some reading, found the radishes may cause some irritation, but not necessarily toxic to the horses if ingested. Contacted the extension agent, and OSU Equine Dept to see if they had any info on it. Extension agent said they more than likely would not eat it, being it was a broadleaf, and to date, nothing from OSU, so apparently nothing out there that they have heard.
I did get a sample of the seed from a salesman last year, so may plant a few, and see what their reaction to the plant is. Still toying with the idea, just need to find one of those seeders, in my price range. Missed a nearly new condition Zip Seeder last year about this time, for $500.00
My problem is 99% compaction, and really just one small area, maybe 50' across that just lay low, and not really worth the expense of drainage. It will soak down pretty fast, if the compacted surface is opened up. Just thought it would be a lot more cost efficient to let Mother Nature do it naturally.
It would be a two fold crop. One to naturally aerate down possibly 24", or more, and the other to retrieve nutrients that have leached down beyond the root zone, and bring them back to the surface, when the radishes break down in the Spring.