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Tillage, Nitrogen, and Cropping System Effects on Soil Carbon Sequestration

^a USDA-ARS, P.O. Box E, Fort Collins, CO 80522
^b USDA-ARS, 119 Keim Hall, East Campus, Univ. of Nebraska, Lincoln, NE 68583
^c USDA-ARS, retired, 226 E. Circle Dr., Canon City, CO 81212

View larger version (28K): [in a new window]   Fig. 1. Soil organic carbon (SOC) in the 7.6- to 15.2-cm depth in the annual crop (spring wheat-winter wheat-sunflower) rotation as a function of N fertilizer rate for the no-till (NT), minimum-till (MT), and conventional-till (CT) treatments.

View larger version (28K): [in a new window]   Fig. 2. Soil bulk density in the 7.6- to 15.2-cm depth in the annual crop (spring wheat-winter wheat-sunflower) rotation as a function of N fertilizer rate for the no-till (NT), minimum-till (MT), and conventional-till (CT) treatments.

View larger version (28K): [in a new window]   Fig. 3. Total soil N (TSN) in the 7.6- to 15.2-cm depth in the annual crop (spring wheat-winter wheat-sunflower) rotation as a function of N fertilizer rate for the no-till (NT), minimum-till (MT), and conventional-till (CT) treatments.

View larger version (27K): [in a new window]   Fig. 4. Soil bulk density in the 7.6- to 15.2-cm depth in the spring wheat-fallow (SW-F) rotation as a function of N fertilizer rate for the no-till (NT), minimum-till (MT), and conventional-till (CT) treatments.