Compacted soil.

Sounds good to me!

Hi. If you are not too intent on planting this year, I would wait for some good rain to really penetrate the soil r then just put your well rotted manure on top to a depth of 4-6 inches if possible, then leave it over winter for the worms to do their thing. You can then plant directly into it next year. I wouldn’t rotivate it any more but give the soil a chance to recover and develop good micorrhysal networks and soil health.

To be honest I feel that unless it’s had really heavy machinery driving all over it, it probably isn’t as compacted as you might thin, unless perhaps if the plastic grass was laid professionally with the soil removed & hardcore etc put down. It’s most likely just this years weather conditions. I’d add a couple of layers of cardboard & as much well rotted manure/mulch as you can muster. As you aren’t going to grow on it this year, wait for the winter rains & then I think you’ll be pleasantly surprised. If not at least you could rotorvate then. But as I practice no dig I think you’ll have saved yourself & the soil a lot of hard work & the soil & microorganisms will benefit tremendously plus you won’t be inundated with all the weed seeds that you will inevitably bring to the surface & provide with the light they need to grow.