Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Post-Contract Land Use Effects on Soil Carbon and Nitrogen in Conservation Reserve Grasslands

Thanh H. Dao*,a, James H. Stieglerb, J. C. Banksc, Laurie B. Boerngend and Bud Adamse

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



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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.

 


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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.

 





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