Organic Grain Yields

From a farmgate post focused on the prices for organic soybeans and corn:

Singerman also reports several studies that indicate organic corn yields were 8 to 10% lower than conventional corn, and organic soybean yields were anywhere from 1% to 19% lower than conventional beans.

Here's the summary:

While price premiums for organic corn and soybeans may seem to be twice that of the prices of conventional crops, that relationship may be more coincidental than normal. Prices for both organic and conventional crops can be volatile, but they are set in different markets, they do not move in lock step with each other, and conventional crops cannot be substituted for organic crops meaning they are separate commodities.