2007/08/01 by Maria do Carmo Horta, José Torrent, J. Torrent · 59 citations
Agricultural and Biological Sciences · Chemistry · Environmental Science · #Adsorption #Chemistry #Chromatography #Desorption #Environmental chemistry #Fractionation #Geology #Inorganic chemistry #Organic chemistry #Phosphorus #Phosphorus and nutrient management #Soil Carbon and Nitrogen Dynamics #Soil and Water Nutrient Dynamics #Soil science #Soil water #Sorption
paper · open access · doi:10.1097/ss.0b013e3180577270
published in Soil Science 172(8), 631-638 (Lippincott Williams & Wilkins)
openalex publication_date 2007/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/02
Although much information exists on the quantitative relationships between phosphorus (P) sorption and soil properties, comparatively less attention has been given to the influence of soil properties and P forms on the kinetics of P desorption and to the relationships between desorbable and sorbed P. The aim of this study was to rationalize the P desorption properties of a group of 29 acid soils representative of agricultural areas of Portugal. The soils differed widely in basic properties, total P concentration (91-1730 mg kg−1), Olsen P (2.5-116 mg kg−1), and relative contents of the "P fractions"-defined operationally in accordance with the seven-step fractionation scheme of Ruiz et al. (1997). P sorption capacity was accurately predicted from the concentrations of oxalate-extractable Al and Fe, as is generally the case with acid soils. Desorption of sorbed P to an anion exchange resin could be described by a combination of two kinetic equations of the Michaelis-Menten type for fast and slowly desorbable P pools. Although the concentrations of both pools were correlated with those of various P fractions, they could not be unambiguously assigned to specific chemical P species. The high correlation found between fast desorbable P and Olsen P testifies to the usefulness of this agricultural P test for acid soils; however, Olsen P tended to overestimate and underestimate fast desorbable P for Olsen P values lesser and greater than ∼80 mg kg−1, respectively. The average ratio of fast desorbable P to sorbed P was 0.21 and that of total desorbable P to sorbed was P 0.60; both ratios increased with increasing degree of P saturation in the soil.