Resumen

POSE, Nélida N  y  ZAMUNER, Ester C. Sorption Index to Estimate Phosphorus Retention Capacity in Soils. Agrociencia Uruguay [online]. 2016, vol.20, n.2, pp.86-94. ISSN 1510-0839.

Agricultural and livestock production systems, with significant amounts of input of phosphorus (P) to the soil, can cause losses of P to surface waters. Research in recent years has been focused on the mechanisms of P retention in different soil types, and searched indexes or parameters associated with fertilization requirements and environmental pollution. Traditionally, P retention parameters have been studied by adsorption isotherms and buffer capacity estimation. Since the technique employed is complex and time consuming for routine analysis, in recent research P Sorption Index (PSI) is proposed as an alternative. This work carried out a literature review, and analyzed and discussed the techniques and calculations used by different researchers to quantify the PSI. The literature shows differences in the methodology for performing the single-point index (soil: solution ratio, amount of P added, temperature and time at the equilibrium, etc.), and in the equation to calculate the PSI. These differences have failed to standardize the methodology, making it difficult to compare results.

Palabras clave : RETENTION; ENVIRONMENTAL RISK; PHOSPHORUS PARAMETERS.

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