Fig. 2. Relationships between (a) modified Kelowna soil-test P (STP) and water-extractable P (WEP); (b) modified Kelowna-based degree of P saturation (DPS) and WEP; (c) STP and CaCl₂-extractable P (CaCl₂–P); and (d) DPS and CaCl₂–P in five Alberta soils.