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Published online 1 March 2008
Published in J Environ Qual 37:325-332 (2008)
DOI: 10.2134/jeq2007.0240
© 2008 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Nitrogen Fertilizer Application on Growing Season Soil Carbon Dioxide Emission in a Corn–Soybean Rotation

Mahdi M. Al-Kaisi*, Marc L. Kruse and John E. Sawyer

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011-1010. M.L. Kruse, formerly graduate student


Figure 1
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  		Fig. 1. Daily soil moisture, soil CO2–C emission rate, and season-long cumulative soil CO2–C emission in 2002 (soybean crop) as affected by the residual N fertilization rate from the previous corn crop at three sites. LSD values for CO2–C emission rate at a specific sampling date indicate significant differences between N rate (P ≤ 0.05); if no value is shown then the difference is nonsignificant. For the cumulative CO2–C emission, different letters indicate significant differences between N rate within each site (P ≤ 0.05).

 

Figure 2
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  		Fig. 2. Daily soil moisture, soil CO2–C emission rate, and season-long cumulative soil CO2–C emission in 2003 (corn crop) as affected by N fertilizer rate applied to the corn in 2003 at three sites. LSD values for CO2–C emission rate at a specific sampling date indicate significant differences between N rate (P ≤ 0.05); if no value is shown then the difference is nonsignificant. For the cumulative CO2–C emission, different letters indicate significant differences between N rate within each site (P ≤ 0.05).

 

Figure 3
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  		Fig. 3. Soil CO2–C emission rate and cumulative CO2–C emission during laboratory incubation of soil samples (0–15-cm depth) collected from three 2003 corn sites in June at four N rates. LSD values for CO2–C emission rate at a specific sampling date indicate significant differences between N rate (P ≤ 0.05); if no value is shown then the difference is nonsignificant. For the cumulative CO2–C emission, different letters indicate significant differences between N rate within each site (P ≤ 0.05).

 

Figure 4
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  		Fig. 4. (A) Microbial biomass C and (B) net mineralized soil N concentrations for soil samples (0–15-cm depth) collected from three 2003 corn sites in June at four N rates. Different letters indicate significant differences between N rates within each site (P ≤ 0.05).

 




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