Summary
Abstract The oxygen isotope ratio of phosphates is a powerful tool to study phosphorus in the soil‐plant system. In the past two decades, the scientific community has made substantial progress in characterizing biogeochemical processes that lead to an alteration of oxygen isotope ratios in phosphates and in evaluating oxygen isotope ratios of phosphates in plants and soils under various environmental conditions around the globe. However, there are still uncertainties with respect to their interpretation in environmental systems. These uncertainties include the comprehensive analysis of isotope endmembers, artifacts during the chemical extractions and the phosphate purification protocols, overlapping isotope values from various processes and sources, gaps of knowledge about isotope effects
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