Accumulation and Distribution Characteristics of Various Phosphorus in Paddy Soil at Different
A soil column experiment was conducted to investigate the accumulation and distribution characteristics of phosphorus in paddy soil in South China with chicken manure application.The results indicated that: NaOH-P accounted for 35.9%～46.7% of the total P in paddy soil,and the C.HCl-P accounted for 18.3%～36%,NaHCO3-P accounted for 7.9%～18.5%,residual-P accounted for 6.2%～15.6%,D.HCl-P accounted for 2.1%～6.8%,and Resin-P accounted for 1.5%～5.5%.Therefore,NaOH-P was the primary P of the accumulation in soil,the secondary was relatively poor validity C.HCl-P,but Resin-P was little.The accumulation of Resin-P,NaHCO3-P,Residual-P and NaOH-P in soils increased significantly along with the increasing of chicken manure application,and the accumulation of D.HCl-P was not significantly enhanced.So,the potential risk of P loss by runoff or by leaching will increase,and the potential risk of P pollution on surface water and ground water will increase as well.The potentiality of soil accumulated Resin-P decreased significantly along with the increasing of soil layer depth,but the risk of Resin-P loss by leaching enhanced significantly.