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Abstract
Ryegrass was grown in pots of soil treated with a fluoride-rich sludge which had been implicated in an outbreak of fluorosis on a farm where it was used as a fertiliser. Results showed an approximately linear relationship between fluoride applied to soil in sludge and concentrations of fluoride in ryegrass tissue. Applications in excess of 8·7 t dry matter (dm)/ha of the sludge tested (equivalent to 290 kg/ha of fluoride) produced potentially toxic concentrations of fluoride in the first cut of ryegrass but plant tissue concentrations of fluoride decreased progressively in two later cuts. Every 100 mg/kg increase in the concentration of fluoride in soil resulting from treatment with sludge produced an increase in the concentration of fluoride in ryegrass of 18 mg/kg dm at cut 1, 8 mg/kg at cut 2 and 5 mg/kg at cut 3. In field conditions, direct ingestion of sludge and soil by grazing cattle may be as important a source of dietary fluoride as that ingested in herbage.
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