Rationale
Phosphorus (P) losses in surface irrigation is affected by irrigation water quality, soil properties and P availabilities. Generally, soluble P losses from irrigated fields reaching water bodies are not large, however, concentrations as low as 0.02 mg L-1 may cause eutrophication of lakes and streams. Eventually P losses from agricultural land to water bodies will have an economic impact once the allowable P loading from all sources is managed to reduce the potential off-site impact. Irrigation runoff soluble P concentrations are affected by spatial, temporal and hydrological, as well as physical and chemical interactions between the soil and water. The purpose of this study was to evaluate P desorption kinetic relationships as affected by soil properties, time, soil:solution ratio, and contact solution chemical properties.