Even on well-drained plots, planting on plowed ground was 45 days later than on ridge till in 1989. Crop Rotations Forages such as alfalfa cannot be included in the rotation without leveling the ridges. And they have been successful in getting a good stand and harvesting the crop. However, the combination of corn and soybean yields on ridge tillage may equal or exceed previous average yields, partly due to earlier planting. Cultivation Cultivation for weed control may be considered a concern and an advantage of ridge tillage.
Cultivation usually improves yields by loosening the surface.
But there is a risk that a rainy June may prevent reforming ridges before corn is too high. Crop shields are recommended because they allow faster cultivation and protect small plants. References Doster, D.H., D.R.Griffith, J.V. Mannering and S.D.Parsons, 1987. Economic returns from alternative corn and soybean tillage systems in Indiana. Purdue University, West Lafayette, Indiana.