Farmers will increase production if they get a whiff of profit. I thought I was pretty clear.
In thinking more on the drought issue I am reminded of California's mismanagement of water rights due to climate change/wildlife preservation policies where the central valley has effectively been denied water. This has lead to many farms going fallow or some farms changing crops to those that require less water. These policies were not drought driven, but environmentalist driven, and have resulted in lower production rates out of California at least.