Bulk blending refers to the preparation of a compound fertiliser by mechanically mixing two or more straight fertilisers in specified proportions. Each granule retains its original composition; the materials do not fuse together[1]. Physical quality governs effectiveness: close particle size distribution and bulk density are required to prevent segregation during handling and spreading[2]. Unlike NPK fertilisers produced by chemical processes where every granule contains all nutrients, bulk blends demand careful handling[3]. In the European Union, Regulation (EU) 2019/1009 requires manufacturers to ensure that blending does not alter the nature of the components and to draw up a declaration of conformity for the mixture whilst retaining those of each individual component[4][5].
Sources
- FAO, Plant nutrition for food security (2006), p. 136 · View the source
- Yara, Fertilizer Industry Handbook 2025, p. 62 · View the source
- Yara, Fertilizer Industry Handbook 2022, p. 60 · View the source
- Règlement (UE) 2019/1009 (produits fertilisants), ANNEX I · View the source
- Règlement (UE) 2019/1009 (produits fertilisants), ANNEX V · View the source
Original text by fertiliser-market.com. Facts and figures are taken from the documents cited, at the page given; no text, table or chart is reproduced from them.
Updated October 27, 2026