Fig. 2. Carbonate-C contents of the near surface zone of the Dalhart fine sandy loam (fsl) and La Casa-Aspermont clay loam (cl) soils under various post-contract land use options at Forgan and Duke, respectively. CC = continuously cultivated, OWBUF = Old World bluestem-unfertilized, OWBF = Old World bluestem-fertilized, CT = conservation-tillage, and NT = no-till.