The rapidly growing popularity and adoption of no-tillage systems of corn production have required us to re-evaluate some of our long established soil fertility practices and recommendations. Recent work by researchers at Kentucky and adjacent states show that the soil surface becomes very acid after a few years of continuous no-tillage corn production. This rapid decrease in soil pH is primarily associated with surface application of nitrogen fertilizers. Most lime recommendations and related research information for row crop production are based on plow-down application. Therefore, the effectiveness of surface-applied and unincorporated lime under no-tillage systems becomes a question of concern. We conducted lime studies on no-tillage corn at Princeton and Lexington to study this situation.
Blevins, Robert L. and Murdock, Lloyd W., "Effect of Lime on No-Tillage Corn Yields" (1979). Agronomy Notes. 108.