Experiments have shown organic matter and nitrogen in the eroded sediments to be five times as high as in the original soil. The Universal Soil Loss Equation is an equation which has been developed by USDA to uniformly evaluate soils for their potential erodibility by water. No till Soil undisturbed prior to planting. Weed control primarily by herbicides. Ridge till Soil undisturbed prior to planting.
Planting is done on ridges.
Crop residues are moved aside from ridge tops at time of planting. Strip till Soil undisturbed prior to planting. Narrow and shallow tillage in row at time of planting. Yields under conservation tillage are usually equal to or better than under conventional tillage provided the soils are not poorly drained and that weeds can be controlled by herbicides. Erosion - A major concern in several countries of the world.