N, P, and K Budgets and Changes in Selected Topsoil Nutrients over 10 Years in a Long-Term Experiment with Conventional and Organic Crop Rotations

摘要: This study presents soil system budgets of N, P and K in six contrasting cropping systems during 10 years a long-term experiment southeast Norway. The included with arable cash-cropping mixed arable-dairy (cash- fodder crops), organic conventional management represented both groups. All major nutrient inputs outputs were measured or estimated. State the art appeared to be balanced terms whereas had an N surplus. By contrast, less up date all showed indications depletion (negative budgets). that mining content occurs, surpluses. results corresponded well differences between ignition loss, P-AL, K-AL K-HNO3 2009. shows fertile may exposed substantial over many before it is detectable by traditional analyses, field budgeting feasible, but data-demanding, approach detect such misbalances at early stage.