Loss of trace elements from agricultural soil

Summary

This field study at Rothamsted Research's North Wyke Farm Platform quantified losses of agronomically essential and potentially toxic trace elements from contrasting agricultural systems during discrete storm events. Arable cultivation resulted in substantially greater soil loss than pasture, with trace elements strongly associated with sediment in arable runoff, whilst dissolved trace element concentrations remained relatively stable during rainfall events. The findings highlight that the fate of trace elements in agricultural runoff varies significantly by element speciation and farming system, with implications for both nutrient depletion and potential off-site contamination.

Regional applicability

The study was conducted at a UK research facility and directly reflects conditions relevant to British agricultural practice. Findings on differential trace element mobility under UK rainfall conditions and the comparison between arable and pasture systems provide empirical evidence for soil and water management policy and nutrient stewardship guidance in UK farming.

Key measures

Trace element loads (copper, cadmium, manganese, nickel, selenium, zinc) in runoff; soil loss rates; dissolved versus particulate-bound metal concentrations; leaching rates; rainfall intensity; fertiliser and manure additions

Outcomes reported

The study quantified loads and forms of copper, cadmium, manganese, nickel, selenium and zinc lost from arable and pasture systems during storm events, comparing both particulate-bound and dissolved trace element losses. Findings showed differential mobilisation patterns between elements and marked differences in loss rates between farming system types.

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