Marine-derived fertilisers: significant possibilities, and some challenges to solve.

Summary in the original language of the document

Significant volumes of organic material from captured fish and seaweed (brown macroalgae) are available and poorly utilised in Norway. A combination of fishbone residues, rich in N, P and Ca, and seaweed residues, rich in K, Mg and S, may constitute a complete fertiliser to be applied in organic growing. Field and pot experiments at NORSØK, Tingvoll, NoRway have demonstrated rapid growth effects of fish bones, and high and long-term beneficial effects of seaweed residues. Potentially toxic elements such as arsenic and cadmium pose a challenge with marine-derived materials, which calls for further studies.