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Alfisol soil is one type of soil in Indonesia with widespread use and commonly cultivated for the development of soybean, especially in Sumatra, Java and Sulawesi island with constraints is soil pH is acidic, and soil fertility is low. Thus, it is necessary to put an input to improve chemical characteristics and productivity of soil. The research aimed to determine the effect of dolomite and bokashi of rice straw enriched filter cake to changes of soil chemical characteristics and on soybean production. This research was arranged according to randomized block design in two factorial, the first factor is the application of dolomite [0 t.ha1 (K0), 3 t.ha-1 (K1), 6 t.ha-1 (K2), 9 t.ha-1 (K3), and 12 t.ha-1 (K4)] and bokashi of rice straw enriched filter cake (SF) as a second factor [0 t.ha-1 (J0), 2 t.ha-1 (J1), 4 t.ha-1 (J2), 6 t.ha-1 (J3), and 8 t.ha-1 (J4)]. It obtained 25 combined treatment, with three replications. Parameters were measured, were: soil pH, Corganic, total N, exchangeable cation capacity (CEC), and base saturation percentage (BSP) and soybean production. The data were analyzed using analysis of variance followed by Duncan's Multiple Range Test (DMRT) α 0.05. The result of research revealed that Dolomite with 12 t.ha-1 dosage and bokashi of SF with 8 t.ha-1 have the best results to changes in soil chemical characteristics and on soybean production. Moreover, there is an interaction between the Dolomite and bokashi of SF to changes of soil chemical characteristics and on soybean production. Keywords—chemical soil characteristics; Alfisol; dolomite; soybean

Changes of Chemical Soil Characteristics by Dolomite and Bokashi Treatment and The Impact of Soybean (Glycine max L.) Production