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Tillage and Crop Residue Effects on Soil Carbon and Carbon Dioxide Emission in Corn–Soybean Rotations

Department of Agronomy, Iowa State Univ., Ames, IA 50011-1010

View larger version (31K): [in a new window]   Fig. 1. Tillage and crop residue effects on soil CO2 emission after 3 yr in a corn–soybean rotation. Least significant difference (LSD) at P < 0.05 for each measuring time is provided in the graph; NS, not significant at P < 0.05. NTR, no-tillage with residue; NTW, no-tillage without residue; ST, strip-tillage; DR, deep rip; CP, chisel plow; MP, moldboard plow.

View larger version (23K): [in a new window]   Fig. 2. (a) Air temperature, (b) soil temperature, and (c) soil moisture in the top 5 cm of different tillage systems and residue covers from 7 to 26 Nov. 2001, after 3 yr in a corn–soybean rotation. For soil temperature, least significant difference (LSD) at P < 0.05 for each measurement time is provided; NS, not significant at P < 0.05. For soil moisture, an error bar for each measurement time is provided. NTR, no-tillage with residue; NTW, no-tillage without residue; ST, strip-tillage; DR, deep rip; CP, chisel plow; MP, moldboard plow.

View larger version (29K): [in a new window]   Fig. 3. Tillage and crop residue effects on cumulative soil CO2 emission after 3 yr in a corn–soybean rotation. NTR, no-tillage with residue; NTW, no-tillage without residue; ST, strip-tillage; DR, deep rip; CP, chisel plow; MP, moldboard plow.

View larger version (21K): [in a new window]   Fig. 4. Linear plot of the Michaelis–Menten equation for cumulative soil CO2 emission. NTR, no-tillage with residue; NTW, no-tillage without residue; ST, strip-tillage; DR, deep rip; CP, chisel plow; MP, moldboard plow.