If it were a good idea from the perspective of farmers, then farmers would already be paying to do it themselves. This isn't the case though, so you will have to pay farmers to do it.
Why does it even have to be on farmland in the first place? If it's such a great idea with no environmental downsides, then dump the crushed rock onto other land instead. Then you can dump more of it without being limited by whatever is optimal for farm yields.
Why does it even have to be on farmland in the first place? If it's such a great idea with no environmental downsides, then dump the crushed rock onto other land instead. Then you can dump more of it without being limited by whatever is optimal for farm yields.