Study of some chemical properties of ultisol soil applied by biochar and compos from some biomasses and incubation time

Biochar and compost applications are alternative in improving soil chemical properties, such as Ultisol utilizing the current abundance of biomass waste. has long available properties takes longer to decompose than compost. This study aims compare effect biochar for several months incubation on properties. research was conducted with pot from plastic cup placed a greenhouse using non-factorial randomized block design control, treatments taken rice straw biomass, empty palm oil bunches, cow dung, 3 replications. The parameters measured were pH H2O, C-Organic, N-total, P. results indicate that provision can increase P 1,2 incubation. is better at increasing pH, best treatment found dung bunches. Meanwhile, manure H2O during time nutrients soil, followed by bunches straw.