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The accurate measurement of soil nitrate (NO3−) is critical for determining rates of nitrogen (N) cycling and potential N losses from ecosystems. Iron (Fe) can interfere with the colorimetric NO3− analysis of soil extracts to cause the appearance of anomalously low NO3− concentrations. To resolve the interference, imidazole or NH 4 Cl–DTPA has been recommended to replace NH 4 Cl–EDTA...
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