Working with our Suppliers of major materials suppliers screened (top 20% of spend) Publication of the IPL Supplier Code of Conduct Publication of IPL Modern Slavery Policy and the development of tools and procedures to assess this risk in our supply chain 504 tonnes of fertiliser bags and farm plastics recycled 87% SELF-SOURCED AUSTRALIAN PHOSPHATE ROCK Phosphate rock, a naturally occurring mineral rock, is used in the production of both Ammonium Phosphate (AP) fertilisers and Single Super Phosphate (SSP) fertilisers.