Soil characteristics involved in phosphorus sorption in Mollisols

CABELLO, MJ, ; FH GUTIERREZ BOEM,; CE QUINTERO,; G RUBIO.

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL

SOIL SCI SOC AMER

Lugar: Wisconsin; Año: 2016 vol. 80 p. 1585 - 1590

0361-5995

The role of different soil properties on defining the P sorption capacity wasinvestigated in a group of Mollisols of the Pampean Region (Argentina). Two single point and threemultiple point P sorption indices were evaluated.  Both simple and multiple regression models indicated that Alox and Feox were the main propertiesdefining P sorption. Aluminumox prevailed as the best predictor ofshort-term P sorption indices and Feox as the best predictor for those indices that involveslonger interaction periods. After Alox and Feox, the best correlations were obtained for the sum of Caand Mg. The higher P retention of soils located in the Southern part of theRegion was associated with the parental material rather than with anthropogenic effects. Obtained information can strengthen P fertilization programs by providing amethodology to estimate fertilizer P requirements to optimize crop yields whilereducing environmental risks.