We should let China buy as much farmland that they want.

Then we pass regulations stating that they can’t send any of the food that is grown there back to China. We can also pass a regulation that says they can’t let the land lie fallow, or else they forfeit the land’s ownership back to US Government. And then when they decide to invade Taiwan someday, we just seize all of that land in retaliation for their act of war.

These are exactly the strategies that the Chinese would use if you try to invest in Chinese farmland.