Effect of Salted Fish Waste and Cow Manure on the NPK Availability and Uptake of Lowland Rice on Peat Soil in Pelalawan, Riau

The low rice yield on thick peat can be overcome if the rice plants are provided with complete nutrients. Various efforts have been done to increase the productivity of Indonesian peatlands, one of which is by adding salted fish waste and cow manure. This research was carried out on a plastic house scale from October 2017 to January 15, 2018 in Pelalawan District, Pelalawan Regency, Riau. This research was conducted using a Completely Randomized Design (CRD), which were L0 = Control, L1 = 1.5 ton.ha -1 of fish waste, L2 = 2.25 ton.ha -1 of fish waste, L3 = 7 tons/ha of cow manure, L4 = 15 ton.ha -1 of cow manure, L5 = 1.5 ton.ha -1 of fish waste + 7 ton.ha -1 of cow manure, L6 = 1.5 ton.ha -1 of fish waste + 15 ton.ha -1 of cow manure, L7 = 2. 25 ton.ha -1 of fish waste + 7 ton.ha -1 of cow manure, L8 = 2.25 ton.ha -1 of fish waste + 15 ton.ha -1 of cow manure. The results showed that the application of cow manure and salted fish waste could increase soil pH, total NPK dan NPK uptake. The best results are soil pH, total NPK dan NPK uptake obtained from the treatment of 2.25 tons/ha of fish waste and 15 tons/ha of cow manure, so the cultivation of lowland rice on peat soil is recommended.