This document summarizes research on using the phosphorus saturation ratio (PSR) and soil phosphorus storage capacity (SPSC) to evaluate the ability of soils to store or release phosphorus in different agricultural systems. The PSR/SPSC approach was tested in tree-based systems like silvopastures and coffee plantations, finding that soils generally had a higher P storage capacity and were less likely to release P when trees were present compared to treeless agricultural lands under similar conditions. The research demonstrates that incorporating trees into agricultural systems can help protect water quality by removing excess phosphorus from soils.
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