Development of soil phosphorus storage capacity for phosphorus retention/release assessment in neutral or alkaline soils

The concept of the soil phosphorus storage capacity (SPSC) was successfully used to evaluate (P) loss risk and P retention acidic soil. This study extended SPSC from neutral or alkaline A total 95 surfaces (0-10 cm) samples were collected Yellow River Delta (YRD) for use in this study. Batch sorption experiments, correlation analysis, stepwise regression, a split-line model calculate threshold value degree saturation (DPS). developed based on DPS value. Based 11.5%, we following equation calculating SPSC: = (11.5% - DPS) × (0.113 SOM (soil organic matter) + 1.343 CaCO3). In continuous system watershed, wetland farmland, vegetable fields (-94.7 ± 79.1 mg/kg) lowest that restored (76.3 26.1 highest. Along transition zone YRD, both natural development human alternations significantly affected loss/retention capacity. terms storage, wetlands are highlands contribute YRD. As result, strongly recommend be fully utilised fertiliser no longer applied prevent into watershed.