Study on the effects of polyacrylamide on phosphorus adsorption and desorption characteristics of soil aggregates
2008
Yang Xueqing | Wang Xudong
[Objective]The research aimed to provide scientific reference for reasonable utilization of polyacrylamide(PAM). [Method]After PAM treatment, the soil aggregates were classified through dry sieve analysis and the adsorption capacity and desorption capacity of all soil aggregates to phosphorus at different phosphorus concentrations were analyzed.[Result] The phosphorus adsorption and desorption of soil sample treated by PAM declined.The amount of phosphorus adsorption increased with the increase of phosphorus concentrations and this increase was fast in low phosphorus concentration area but slow in high phosphorus concentration area. At different phosphorus concentrations, adsorption showed a shape changing trend.The phosphorus adsorption was related to phosphorus concentration and the 2-3 mm aggregate had the highest desorption rate while 0.1-0.25 mm aggregate and 0.45-1 mm aggregate had lowest desorption rate. [Conclusion]The PAM treatment generated significant influence on phosphorus adsorption and analytic features of aggregate in all size fractions.
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