Fluoride accumulation in pasture forages and soils following long-term applications of phosphorus fertilisers

摘要

Ingestion of soils with high fluoride(F)concentration may cause chronic fluorisis in grazing animals. Analysis of New Zealand pasture soils with long-term phosphorus(P)fertilisation histories that total surface soil(0-75 mm depth)F concentration increased up to 217-245 mg kg~-1 with P fertiliser application. One-third to two-thirds of F applied in fertilisers resides in the top 75 mm soil depth. Pasture forage accumulation of F was low, and therefore, F intake by grazing animals through pasture consumption is expected to be much lower than F intake by soil ingestion.