| In organic growing, both in Norway and elsewhere in Europe, significant amounts of fertiliser products not derived from certified organic farming are used, such as dried poultry manure or other types of fertilisers derived from conventional farms such as animal by-products. Organic agriculture aims to be independent of conventional agriculture, and fertilisers derived from harvesting of natural materials may be a relevant alternative. Catching of wild fish, and collection or cultivation of seaweeds, result in residual products which contain essential plant nutrients. Sediments of fish bones, which are residues from hydrolysis of fish remains used to produce fish oil and soluble proteins, are rich in nitrogen and phosphorus. Residues from seaweeds (algae... |
