The evaluation of phosphorus leaching risk of 23 Chinese soils Ⅱ. The relationships between soil properties, P adsorption characteristics and the leaching criterion STUDY ON THE ADSORPTION AND DESORPTION OF PHOSPHORUS IN SOILS AND PHOSPHORUS REQUIREMENT Phosphate adsorption and desorption characteristics of several fly ashes Effect of Citric Acid, Glucose and Organic Matter on Plant P Uptake and Soil P Fractionations in a Highly Weathered Ultisol ADSORPTION OF RADIOACTIVE NUCLIDE ~(95)Zr IN SOILS Changes of iron oxides and phosphorus adsorption-desorption in paddy soils under alternating flooded and dried conditions