The biochar is one of the products generated from the thermal decomposition, also named pyrolysis, of a particular biomass under an atmosphere almost or completely absence of an oxidizing agent, like the oxygen present in the air. Studies based on Terra Preta de Índio indicate that the biochar can contribute directly with the improvement of the quality of the soil, allowing the recovery of degraded soils, besides contributing with the growth of plant species. Another benefit from the addition of the biochar in the soil is the capacity of retaining nutrients provided by fertilizers, reducing the lost by leaching. With the objective of conditioning soils, three biochars were studied. Firstly, the biochars were characterized to determine the chemical and physical differences among them. Posteriorly, experiments of fertilizers adsorption of were carried out with the same biochars samples. The biochars used in this study were produced in three different conditions, being two of them from residue of different biomass species, denominated biochar of slow pyrolysis and biochar of slow pyrolysis activated, and the raw material of the third one is residue of eucalyptus, denominated biochar of fast pyrolysis. The fertilizer used in the experiments of adsorption was a biofertilizer produced from Swine s residues and Triple SuperPhospate, provided by EMBRAPA Solos, located in Rio de Janeiro/RJ. In the experiments of characterization, high porosities were identified in all biochars, being the fast pyrolysis biochar the one with higher value. Among the biochars studied, the fast pyrolysis biochar is the one with the highest total nutrients content and no significant differences were observed in the total nutrient content in others biochars. Low cellulose contents were identified in the biochars, however the lignin contents were high. The sorptive capacity evaluated was high and basically the same value for the three biochars. In the three soil samples, the evaluation of the biochars as adsorbents of fertilizers were satisfactory and can be used for improving degraded soils. When applied in a non-degraded soil, the slow pyrolysis and slow pyrolysis activated biochar did not have great influence in the sorptive capacity of the soil, however they affects the kinetic parameters determined by the pseudo-second order model.