The Relationship Compost Produced from Material Animals and Plants to Chemical Properties of Ultisol

One of the efforts to improve the chemical properties of Ultisol is the application of compost. The research was conducted from April to August 2022, with the aim of studying the relationship between compost from animal and plant materials and the chemical properties of Ultisol. The research was conducted in a completely randomized design (CRD), with 6 treatments (Control; FC A; FC B; FC C; FC D; and FC E) with 3 replications. The additional ingredients of each compost and its decomposer are different, so the quality, quantity, and effect on the soil are also different. Compost was applied at the equivalent of 5 tons/ha (5 g/2kg) of soil. The parameters analyzed were Organik-C (Walkley and Black); pH H2O (1:2.5); total-N (Kelshall); P-available (Bray II); K-exchangeable, Ca-exchangeable, Mg-exchangeable, CEC (Ammonium acetate extract 1N pH 7); Al-dd (Volumetry); C/N; total-P, total-K, total-Ca, total-Mg (Wet-soaking); and moisture content. The results showed that KA, pH, total nutrients (N+P2O+K2O5), Organic-C, and C/N ratio in compost D had met SNI 7763/2018, and had an effect on increasing pH, P-Available, K-dd, Ca-dd, Mg-dd. For PK A and compost B, it increases soil C-Org, compost C increases soil Total-N, and compost E has an effect on increasing soil CEC. Based on these tests, compost D with chicken manure, husk ash, dolomite, and humic acid is the best.