Figure 4. This figure illustrates that the increased infiltration of rainfall (less runoff) is a result of both no tillage and residue cover. NT indicates no tillage; CT indicates conventional tillage. The symbols + and – R mean with or without plant residues. In this experiment in Alabama, black oat residues were removed from one of the NT treatments and added to one of the CT treatments. The results were much less runoff under NT compared to CT, and even less runoff for the added residue treatments. These results suggest that no tillage with high-residue cover crops provide optimum rainfall runoff reduction (data from Truman, Shaw, and Reeves 2005).
Credit: Figure by Daniel Dourte