[Simulation of relationship between dissoluble phosphorus loss and runoff time].

The environmental sensitive phosphorus point of a cinnamon fluvo-aquic soil was 69.4 mg/kg (Olsen-P) evaluated by fitting soil Olsen-P and CaCl2-P content using Heckrath split-line model. The relationship between dissoluble phosphorus (DP) lost from runoff in soils applied different P rate and runoff time was studied using circular water method.