Articles | Volume 13, issue 19
https://doi.org/10.5194/bg-13-5609-2016
https://doi.org/10.5194/bg-13-5609-2016
Research article
 | 
07 Oct 2016
Research article |  | 07 Oct 2016

Effect of iron oxide on nitrification in two agricultural soils with different pH

Xueru Huang, Xia Zhu-Barker, William R. Horwath, Sarwee J. Faeflen, Hongyan Luo, Xiaoping Xin, and Xianjun Jiang

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Short summary
The effect of Fe oxide on N transformation processes were different in soils as a function of pH. 15N-labelled ammonium and nitrate were used separately to determine N transformation rates combined with Fe oxide (ferrihydrite) addition. Iron oxide addition stimulated net nitrification in the low-pH soil (pH 5.1), while the opposite occurred in the high-pH soil (pH 7.8). Fe oxide increased NH3-N availability by stimulating N mineralization and inhibiting N immobilization at low pH.
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