Conference Abstract Book

Results from field trial Partial annual plot-level balances (kg/ha) of C, N, P, K, Ca and Mg under three scenarios: Scenario 1 (CPH retained), as actually carried out Scenario 2 (CPH removed) Scenario 3 (CPH removed and no fertiliser) • CPH removal would reduce the partial balances for carbon and nitrogen by 15.6% and 19.6 % respectively. • CPH plays a minor role in the maintenance of soil phosphorus, calcium and magnesium, but it plays an important role for crop potassium. • Diversion of CPH from current practices should consider the long-term effects of soil quality, especially because it might create increased reliance on mineral fertilisers. 11