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Published online 1 January 2007
Published in Soil Sci Soc Am J 71:108-117 (2007)
DOI: 10.2136/sssaj2005.0170
© 2007 Soil Science Society of America
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Short-term Response of Soil Iron to Nitrate Addition

C. J. Matocha*

Department of Plant and Soil Science, Univ. of Kentucky, N-122 Agricultural Science Center-North, Lexington, KY 40546-0091

M. S. Coyne

Department of Plant and Soil Science, Univ. of Kentucky, N-122 Agricultural Science Center-North, Lexington, KY 40546-009


Figure 1
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  		Fig. 1. (A) X-ray diffraction patterns of the clay fraction after Mg saturation at 25°C, Mg-glycerol solvation at 25°C, K saturation at 25°C, and K saturation at 550°C; (B) representative scanning electron micrograph of the clay fraction. The energy dispersive x-ray spectrum shown corresponds to the platy particle indicated by the arrows. The Au and Pd were a result of the coating process. Scale bar equals 5 µm and no peaks were detected beyond 10 keV.

 

Figure 2
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  		Fig. 2. Time course of (A) solution Fe(II), (B) oxalate-extractable Fe(II), (C) solution Fe(III), and (D) solution NO3– for the high-N treatment and high-N control soil slurries. The solution NO3– values for high-N–sterile are plotted in (D). Error bars represent the standard deviation from the mean for duplicate or triplicate runs.

 

Figure 3
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  		Fig. 3. Michaelis–Menten kinetic plot in anoxic soil slurries of the Sadler silt loam. The line is a nonlinear fit of the Michaelis–Menten equation to the data. Error bars represent the standard deviation from the mean for duplicate or triplicate runs.

 

Figure 4
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  		Fig. 4. Time course of (A) oxalate-extractable Fe(II), and (B) solution NO3– for the low-N treatment and low-N control soil slurries. Error bars represent the standard deviation from the mean for duplicate or triplicate runs.

 

Figure 5
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  		Fig. 5. Time course of (A) solution Fe(II), (B) oxalate-extractable Fe(II), (C) solution Fe(III), and (D) solution NO3– for high-N–W treatment and high-N–W control soil slurries. Error bars represent the standard deviation from the mean for duplicate or triplicate runs.

 




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