Shifting to more acres of continuous corn may be advantageous for operations with particularly high corn yields, according to Gary Schnitkey, agricultural economist at the University of Illinois. To see if you fit in that category, divide corn yield by soybean yield. If the result equals more than 3.4, more intensive corn production could work for you. But any corn after corn adds uncertainty, as well as costs from yield drag, higher seed and fertilizer costs, and the need for additional machinery.