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Post-Contract Land Use Effects on Soil Carbon and Nitrogen in Conservation Reserve Grasslands

^a USDA-ARS, 10300 Baltimore Ave., BARC-East, Beltsville, MD 20705
^b Dep. Plant and Soil Sci., Oklahoma State Univ., Stillwater, OK 74078
^c Dep. Plant & Soil Sci., Oklahoma State Univ., Altus, OK 73521
^d Usda-Nrcs, Beaver, Ok 73932
^e Usda-Nrcs, Altus, Ok 73521

View larger version (48K): [in a new window]   Fig. 1. Effects of number of years of post-contract land use on soil total C and organic C in the 0- to 0.1-m depth of Dalhart fine sandy loam (fsl) and La Casa-Aspermont clay loam (cl) soils near Forgan and Duke, OK, respectively.

View larger version (35K): [in a new window]   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.