The study looked at different ways of tilling the soil for growing crops in the Great Plains. They compared conventional tillage, reduced tillage, no-tillage, and occasional tillage. They found that no-tillage had higher sorghum yields and profits compared to the other methods. Even if occasional tillage was needed in a long-term no-tillage system, it didn't significantly affect crop yields or profits in the first 5 years. So, overall, no-tillage seems to be the best option for growing wheat and sorghum in the Great Plains.