Effect of fluoride supply on fluoride concentrations in five pasture species: Levels required to reach phytotoxic or potentially zootoxic concentrations in plant tissue

摘要: Recent findings have highlighted the possibility of increased fluoride (F) concentrations in herbage through F taken up from soil via plant root. This paper aimed to assess risk reaching phytotoxic or zootoxic pasture plants. Five species commonly found improved pastures Australia, sown subterranean clover (Trifolium subterranean) and cocksfoot (Dactylis glomerata), weeds barley grass (Hordeum leporinum), scotch thistle (Onopordum acanthium) sorrel (Rumex acetosella) were grown complete nutrient solutions with graded levels added determine effects F− activity solution on phytotoxicity uptake by their roots. A model was developed using data these culture experiments literature. The assessed plants over a range pH values determined roots concentrations, potentially injurious grazing animals, shoots. Modelling suggested that studied would not accumulate shoots deleterious animals root neutral agricultural soils. risks addition soils phosphatic fertilisers leading reduction growth animal health are therefore low. However, highly F-polluted soil, as becomes more acidic alkaline, increase.