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Cropping Intensity Enhances Soil Organic Carbon and Nitrogen in a No-Till Agroecosystem

^a Great Plains Systems Res. Unit, USDA-ARS, P.O. Box E, Fort Collins, CO 80522
^b Dep. of Soil and Crop Science, Colorado State Univ., Fort Collins, CO 80523

View larger version (33K): [in a new window]   Fig. 1. Soil organic C in the 0- to 2.5- and 2.5- to 5-cm depths after 12 yr under no-till management as affected by cropping intensity with grass as a reference point (averaged over locations and slopes). Means followed by a different letter within depths are statistically different (P < 0.05) using Fisher's LSD.

View larger version (42K): [in a new window]   Fig. 2. Soil organic C as affected by PET gradient, slope position, and cropping intensity in the 0- to 10-cm depth. Means followed by a different letter are statistically different (P < 0.05) using Fisher's LSD.

View larger version (45K): [in a new window]   Fig. 3. Soil total N in 0- to 2.5- and 2.5- to 5-cm depth after 12 yr in no-till management as affected by cropping intensity with grass as a reference point (averaged over locations and slopes). Means followed by a different letter within depths are statistically different (P < 0.05) using Fisher's LSD.

View larger version (34K): [in a new window]   Fig. 4. Soil total N as affected by PET gradient, slope position, and cropping intensity in the 0- to 10-cm summed depth (averaged over locations and slopes). Means followed by a different letter are statistically different (P < 0.05) using Fisher's LSD.

View larger version (29K): [in a new window]   Fig. 5. Annualized stover inputs over a 12-yr period in no-till management as affected by the interaction of cropping intensity and location (PET gradient). Means followed by a different letter are statistically different (P < 0.05) using Fisher's LSD.

View larger version (23K): [in a new window]   Fig. 6. Relationship of annualized stover production and soil organic C (SOC) and total N in the 0- to 10-cm depth after 12 yr under no-till management.