The Western Pennyroyal area of Kentucky consists largely of deep, well-drained limestone-derived soils occurring on an undulating to rolling landscape. A thin loess mantle overlies the limestone residuum in many areas. Soils on these landscapes are capable of good crop production, providing the basis of the rather intensive grain-hay- tobacco-livestock farming systems common to the Pennyroyal area. Because of the well-suited physical characteristics of these soils, alfalfa is a very important hay crop to this area.
Vaught, H. C.; Wells, Kenneth L.; and Driskill, K. L., "Alfalfa Response to Varying Rates of Phosphorus and Potassium Fertilization on Deep, Red, Limestone - Derived Soils of the Pennyroyal Area In Kentucky" (1977). Agronomy Notes. 113.