Do not exceed the limits for the average annual rate of addition through sewage sludge of toxic elements on arable soils

Concentrations of potentially toxic elements (PTEs) are kept below maximum permissible limits on arable soils

Maintain/improve chemical soil status

Reduce concentrations of toxic elements within crops

Food safety - toxic elements

Reduce crop damage from phytotoxic elements

Maintain / improve crop yields

Increase farm income

Economic viability

Efficient use of resources - energy

Ensure food is available to meet consumer demand