Abstract: Research results about competitive adsorption and desorption of phosphate (P) in recent years are summerized in this paper. Many anions in soils are able to compete the adsorptive sites with P, resulting in a decrease in the amount of Padsorbed. Organic matter either promotes or inhibits Padsorption, and pHis one of the main factors affecting Padsorption. Most of Pfixed on soil surface through adsorption is hard to be desorbed, and the process of Pdesorption has an evident lagging phenomenon. Generally, only physically adsorbed Pcan be desorbed, and chemically adsorbed one forms two coordination bonds with metal cations, very hard to be desorbed by leaching. There are many factors affecting Pdesorption, one of which is the type of desorptive reagents.

Key words: Phosphate, Competitive adsorption, Desorption, soil hydraulic pro-perties, saline soil, biochar, polyacrylamide, coastal reclamation region