This research was conducted on soils of small farmers in the Colonia Tovar - Venezuela, with an approximate height of 2000 m over the sea level, characterized by its template mountain weather. The sampling was done in the first 20 cm depth along 50 m transects, in three locations with different uses: forest, growing crops of strawberry and peach. All samples were processed for organic matter chemical fractionation. Fulvic acids, humic acids and no-humic substances by the Schnitzer and Schuppli method; total organic carbon (TOC) and organic carbon in each fraction by the Walkley and Black wet oxidation method modified for Heanes. Based on these results we determined the indices of humification. Randomized complete block with five repetitions design was used, the information were analyzed with Statistic 8,0 statistical package. In all parameters evaluated, highly significant differences were obtained. The forest remains higher in all cases: 32,3; 9,7; 10,9; 53,0 and 61,2 g.kg(-1) of carbon for CAH, CAF, CSNH, Cext y COT respectively. According to the indexes, it was noted that the forest has a more stable and complex organic matter, and has a higher degree of humification (79%). Was concluded that the crop decrease the organic carbon content in all fractions of organic matter in these soils, as well as its degree of polymerization.
