summary and conclusions
in this study we clearly see that it takes very long time to reduce soil test P concentration and P leaching even if application ceases. Reductions in P-AL in the topsoil were found in all soil between the beginning and end of the study, but only one soil (kungsangen clay ) showed a significant decreasing trend in DRP leaching losses.
this was also the soil with lowest P-AL level,and mineral P during many years,proved to be difficult.After 11 years ,withour P application , P leaching and soil test P were still high while harvests were low. Further research is needed on how to effectively reduce P leaching losses soil with high