[Iowa Granny]

My guess is that LESS than 1% of the corn in the 4 major corn growing states is grown under irrigation.

Iowa, Illinois, Ohio and Indiana are primarily dry land farming states. There are a few exceptions along the Mississippi river where the soil is sandy and won't hold moisture.

So to suggest that growing corn will deplete the aquafers is simply NOT the case in the major corn growing states.

[USFRIENDINVICTORIA]

I learn something new every day on Free Republic. Thanks.

[CedarDave]

The 100th meridian is the longitude commonly used to delineate areas to the west and east where irrigation is necessary or not necessary, respectively. It certainly is not completely true, but a good rule of thumb for this discussion.

The Boundary Between the Moist East and Arid West

(But you knew that already, didn't you Granny!)