Limited information is available on the effect of pooling subsamples of soils on the dynamics of diffusive phosphorus (P), the phosphate ions in the soil solid phase that can equilibrate with the solution under a gradient of ionic P concentration. We examined the change in the parameters of the kinetic Freundlich equation, which accounts for the interactive effects of time (t, min) and soil solution P on the gross amounts of diffusive soil P. A common

This work aimed to test the ability of laboratory experiments to predict long term changes in plant-available soil P in two grassland experiments carried out on a Luvisol (Erce´, French Pyrenees) and a Brunisol (Gramond, Massif Central, central France) since 1999 and 1998, respectively. Each experiment consisted of two annual rates of N and P fertilization arranged in four randomised blocks. Dry matter yields and P contents were measured for each