Dependence of 0.01 M CaCl 2 Soluble Phosphorus upon Extractable P and P Sorptivity in Paddy Soil

Removal of phosphate from soil by leaching, runoff, and plant uptake is strongly influenced by the content and absorption characteristics of P in soil. In this study the relationships between water soluble phosphate and phosphate retention capacity of the soil was investigated. Water soluble and available phosphate, and phosphate absorption characteristics of 35 paddy soils were measured during incubation at . Water soluble phosphate content was highly correlated with available phosphate content, phosphorus absorption capacity (PAC), and phosphate absorbed (PS) in air-dried and wet soils. The most significant relationship was found between water soluble phosphate and the ratio of available phosphate and phosphate sorbed, and the relationship (Av. )+0.0374 could be suggested for the estimation of water soluble phosphate from soil phosphorus characteristics.