A dairy farmer I follow on Twitter just posted this:
https://cals.cornell.edu/news/2022/04/frequently-asked-questions-about-highly-pathogenic-avian-influenza
Not really any new information that I could find (certainly no "pretty safe by Date X"), but wanted to share it regardless. There are...
This was going to be my suggestion as well. I believe this is called "solarizing"; we did it to a decently-sized piece of our land to KO various weed, grass, and other plants so we could turn it into a pollinator meadow.
Pray for sunlight and lots of it!
The disease infected a flock in the next county over; this weekend, while we were out planning to expand our run (by the way—once that is done, should we somehow sanitize the earth before letting the flock in there?), we could see our new neighbors' flock roaming around. At least they have not...