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Iron (Fe) redox cycling and sorption/complexation reactions influence numerous soil biogeochemical processes, and the precise, rapid, and low-cost determination of reactive Fe pools is critical for understanding these dynamics. Colorimetric methods are often used to measure Fe, yet assay conditions vary widely among studies, and the robustness of these methods and their potential interferences remain...
Nutrient cations can limit plant productivity in highly weathered soils, but have received much less attention than phosphorus and nitrogen. The reduction of iron (Fe) in anaerobic microsites of surface soils can solubilize organic matter and P sorbed or occluded with short-range-ordered (SRO) Fe phases. This mechanism might also release occluded cations. In the Luquillo Experimental Forest, Puerto...
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