If we tried to do that in MY area, it would bring lots of unwanted attention from government agencies. We have to get permits just to do farm field ditching. I live in an area once dominated by farming, but has now been taken over by “citidiots”.
I’m not saying what repete says to do is wrong in any way, but be sure to “read the room” before you bring in a dozer with rippers. It might be perfectly fine in your area, or it might require permits and lots of erosion and run-off protection.
We have more of a “leave it be” group overseeing what happens in our area. Probably why we are overrun with invasive species and have 100’ trees blocking everything now. Because of that, I take a more subtle approach and rehab fields one smaller area at a time. Don‘t like attracting attention from the “new environmentalists” in my area. I haven’t owned a sprayer for over 10 years and quite honestly, don’t agree with spraying chemicals at nauseam like some farmers.
Just one man’s opinion here, but for the price of hay, I would never spend that kind of money to get rid of bumps and low spots and I mean no disrespect to repetes ideas. Maybe would consider for a higher profit/acre crop.
I have invested in tractor with suspensions and attachments with tandem walking beam suspensions in some cases. That is how I make a bumpy field feel smoother.