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Long-Term Changes in Soil Carbon under Different Fertilizer, Manure, and Rotation

Testing the Mathematical Model ecosys with Data from the Breton Plots

^a Dep. of Renewable Resources, Univ. of Alberta, Edmonton, AB, Canada T6G 2E3
^b Pacific Northwest National Lab., 901 D St. S.W., Suite 900, Washington, DC 20024-2115 USA

View larger version (30K): [in a new window]   Fig. 1. Measured (symbols) and simulated (lines) soil C content in the upper 0.15 m of the profile during the past 70 yr of the control, fertilizer, and manure treatments in the 2- and 5-yr rotations

View larger version (26K): [in a new window]   Fig. 2. Soil C content simulated in the entire profile during the past 70 yr of the control, fertilizer, and manure treatments in the 2- and 5-yr rotations

View larger version (25K): [in a new window]   Fig. 3. Soil C content simulated in the entire profile during the next 70 yr of the control, fertilizer, and manure treatments in the 2- and 5-yr rotations under current harvest practices

View larger version (25K): [in a new window]   Fig. 4. Soil C content simulated in the entire profile during the next 70 yr of the control, fertilizer, and manure treatments in the 2- and 5-yr rotations under reduced harvest practices