You can educate them on how much your sprayer, tractor and combine cost.  Ask them if they are prepared to pay the bill for fixing said machine if it got busted by their cinder blocks.  Tell them how much it costs you to plant a crop and ask them if they are prepared to pay for that crop if their fireworks catch said crop on fire and destroys it. Attempt to get them to understand why they can't do things like this on YOUR property.  Attempt to get them to see that it isn't just about property rights, but, about your livelihood.  Maybe you can get them to see the light!  Good luck!