This report addresses the results of an experiment with field trials with potatoes and silage maize onsandy soil in 2006 in order to obtain a suitable indicator for predicting N-mineralisation after ploughing the grassland. This study is part of a larger project with more field trials and a laboratory experiment. Ploughed grassland on the locations selected provided much nitrogen, due to which it was not possible to infer an indicator from the crop response for adjusting nitrogen recommendation. N-total seems to be the most promising parameter in predicting nitrogen mineralisatio
