Can now control the food supply
Can now raise domestic food prices to ridiculous levels
Can now force Chinese food imports
Can now direct any policy he wishes
You can grow up to 60,000lbs of food per acre depending on the food.
Take something like potatoe which is 25,000 lbs per acre
That is over 6 Billion pounds. 6,050,000,000
Obviously it won't be perfect yields or exactly that, but it will be enough to shift food prices significantly if that was the goal.