The volume of fertiliser is in turn determined through a bottom-up process. In each village a definitive plan needs group (Rencana Definitif Kebutuhan Kelompok, RDKK) of farmers establishes their fertiliser requirements. This is aggregated up at the district and provincial levels to obtain a national volume of fertiliser demand. For non-urea fertilisers, the subsidy is presented to offset the fertiliser selling price.