They were probed NaOH 1 KOH, Na 4 P 2 O 7 , NaOH + Na 4 P2O7, and urea in different concentration for extract humic and fulvic acids from lombricompost. It was found that NaOH 0.1 M is the desirable extractant because is efficient, low in salt and economic. It was made extractions of AH and FA from a eight lombricomposts (cow dung, filter-press cake, coffe pulp and grass residues, with and without lime) with NaOH 0.1 M to evaluate the yield (organic C) and the quantities obtained by a process ajusted in the present research. The results indicated that the lombricompost from cow dung, filter-press cake and grass residues had similar yields of organic C. C as AH, but superior to the coffee pulp lombricompost. The AH had high concentration of organic C. C compared with FA. The humification ratio in the lombricomposts was higher than soils, turbes, lignites, coals, etc. The lime increase the yield of organic C in both lombricomposts and AH.