PT Pupuk Sriwidjaja Palembang (PSP) produces 1,222 tons fly ash per month from the operation of a coal boiler with capacity 1x23 MW. Fly has potential physical properties and mineral content. The Government Regulation No.22 2021, which classifies as non-B3 waste, open up opportunities to utilize in fertilizer product. In this project, development NPK 15-10-12 filler testing on tomato plants bee...