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The formation of humic substances (humic acid, fulvic acid, and humin) which comprise the majority of soil organic matter, still needs to be clarified because these very complex processes may involve numerous organic components as starting materials, as well as many reactions such as oxidation, polymerization, condensation, and hydrolysis. Altitude-based soil samples were taken from the organic coffee plantation at Bener Meriah District, Bandar and Bukit subdistrict, Aceh Province, Indonesia. Soil types are Aquic Hapludand (alt. < 1,000 m asl), Typic Hapludand (alt. 900 – 1,600 m asl), and Typic Durudand (alt. > 1,500 m asl). Descriptive methods followed by field investigation and laboratory analysis were used. The lands were planted since 1992 consisting of two subdistricts (Bandar and Bukit), Bener Meriah District, Aceh Province, (96 51 41 96 59 44 E and 4 42 49 4 50 27 N). Research objects were open land spaces planted by Arabica coffee plants covering all communities’ coffee plantation in Bandar and Bukit subdistricts, Bener Meriah Districts. Arabica Coffee plantations at Bandar and Bukit Subdistricts with variety of catimor jaluk, plants density 2,500 plants per hectare, age 15 years have been managed organically since 1992. The soil profile was made on each measurement point, and each soil horizon of it, soil samples were taken for Humic substances (HA and FA) analysis and chemical analysis (pH, CEC, and organic C). Our results showed that the content of fulvic and humic acid differs on each horizon and among altitudes. Humic acid content on the surface horizon ranges from low to high. The highest humic acid content was found on the surface horizon at an altitude of 1,050 m asl. The higher the altitude, the humic acid content decreases on the surface horizon.

Fractionation of Fulvic And Humic Acid On Andisol Based On Altitude Under Organic Arabica Coffee At Bener Meriah District, Aceh Province