P accumulation of Polygonum hydropiper, soil P fractions and phosphatase activity as affected by swine manure

•Swine manure promoted better growth and increased P accumulation of Polygonum hydropiper.•Polygonum hydropiper can utilize various P fractions from manure impacted soil.•The mining ecotype was more efficient in mineralizing Po compared to the non-mining ecotype.•Soil acid phosphatase and alkaline phosphatase activities were enhanced by swine manure and rhizosphere process.•High soil acid phosphatase and alkaline phosphatase activities resulted in enhancing Po mineralization.

Animal manure is a good nutrient source for plant growth and the application of manure also affects rhizosphere processes. This study was conducted to investigate the effects of swine manure application on plant growth, P uptake, and rhizosphere characteristics of two ecotypes of Polygonum hydropiper. A mining ecotype (ME) and a non-mining ecotype (NME) were grown for 8 weeks in soils added with a series of swine manure (0–100 g kg−1). In the study, plant P content and soil properties were analyzed. Biomass and P accumulation in P. hydropiper were significantly higher at 100 g kg−1 compared to the control. Besides, biomass and P accumulation of the ME were higher than the NME’s. Swine manure application increased the levels of various P fractions. H2O-, NaHCO3- and NaOH-Pi (Pi, inorganic P) could be utilized efficiently by both ecotypes. Significant depletions of NaHCO3- and NaOH-Po (Po, organic P) were observed in the rhizosphere of the ME compared to the NME. No statistical changes of HCl- and residual-P were observed in the rhizosphere. Acid phosphatase and alkaline phosphatase activities were enhanced by both swine manure application and rhizosphere processes. In conclusion, P. hydropiper can utilize various P fractions from manure impacted soil and the ME shows a higher ability than the NME to mobilize Po.