Flávio Araújo Pinto
Abstract:
Soil phosphorus (P) sorption is a phenomenon that varies as a function of soil characteristics, intensity and magnitude, making it the source or drainage of P. The goal was to quantify phosphorus sorption and desorption and to evaluate the interactions between these and the physical and chemical attributes of soils. The study was conducted in seven soils originally under Cerrado vegetation and in non-anthropized areas. The sorption values obtained were adjusted to Langmuir isotherm, being evaluated the Maximum Phosphorus Adsorption Capacity (CMAP), the Adsorption Energy (EA) and the Phosphorus Capacity Factor (FCP) calculated as a function of the P-sorbed contents. and P-desorbed. CMAP values were classified as high in most soils, ranging from 283 to 2635.7 mg kg-1 and correlated with the levels of organic matter, clay, silt, sand, base saturation and pH. The phosphorus capacity factor was higher in soils where the highest phosphorus adsorption capacity was higher. The use of only one soil attribute, clay content, as a classification criterion for the recommendation of phosphate fertilization is susceptible to errors and more factors should be used for proper soil phosphorus management.
