Effect of Different Sources of Phosphorus Fertilization on Rubber Tree Seedlings Growth and Soil Phosphorus Fractions
The effects of different sources of phosphorus fertilizer application on rubber tree seedling growth and soil phosphorus fractions on Latosol derived from basalt were studied in a pot experiment.Hedley's sequential extraction method was used to investigate the effect of different P fertilization on the changes of the inorganic and organic P fractions.The Kunyang Phosphate Rock (KPR,as P) was added to obtain rates of 0 mg/kg soil (CK),100 mg/kg soil (PR100),and 250 mg/kg soil (PR250) and superphosphate at 100 mg/kg soil (SSP100).The results showed that the application of phosphate rock (PR) and superphosphate significantly increased the rubber tree seedling dry weight,plant height,stem diameter,and total phosphorus uptake,and leaf P concentration of the rubber tree seedling under PR250 and SSP100 treatments significantly decreased.After PR application,soil Resin-P,NaHCO3-Pi and NaOH-Pi,HCl-P and Residual-P were significantly increased,and NaHCO3-Po and NaOH-Po were stable and not affected.Plant dry weight and total phosphorus uptake were both positively correlated with soil Resin-P,NaHCO3-Pi and NaOH-Pi at 0.05 level.At the end of the experiment,it was found that 33.1％ of KPR was dissolved into soils,and 43.5％ of the KPR existed in the soil as the form of Residual-P under the two rates of the KPR applications.In order to improve soil P availability and P nutrition status of rubber tree on soils derived from basalt,it is highly recommended to select and use high reactive PR for direct application,which may reduce the risk of coating of PR particles by soil iron,aluminum and manganese oxide.
Phosphate rockRubber tree seedlingsLatosolHedley's phosphorus sequential fraction
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