N. J. Barrow

When ions react with a variable-charge surface, the charge on the ion causes feedback effects. Changes in both the charge on the surface and the pH affect the shape of the sorption curves. Organic phosphates and inorganic P form a sequence; the smaller the ion, the greater the effect. Adsorption is followed by diffusive penetration. Again, the smaller the ion, the greater the effect. We think penetration after adsorption helps explain the persistence of organic phosphates in soil.

1. Introduction Over the past few decades, human activities have been the drivers of ecosystem transformations through the conversion of natural landscapes into agricultural and urbanized lands, causing significant evolutions in soil physical and chemical properties [,,]. The behavior of phosphorus (P) is affected by its reactions with soil, including sorption reactions that determine its movement towards plant roots and removal from soil by leaching [].

Supporting Information Filename Description ejss13418-sup-0001-Supinfo.pdfPDF document, 1.1 MB Data S1: Supplementary File ejss13418-sup-0002-TableS1.xlsxExcel 2007 spreadsheet , 24.6 KB Table S1: Detailed soil properties for a range of Vertisols from the Northern Grain Region of Australia and other contrasting soils