Ecosystem exploration by humans has led to environmental changes on Earth, such as the release of polluting gases, rising global temperatures, deforestation, soil degradation, and so on. New techniques have been developed that seek to improve the chemical and physical quality of the soil, the recovery of biodiversity and also contribute to reduce the effects of climate change. Biocarbon is produced from pyrolysis of organic waste, which can be applied to the soil to improve the quality, besides being a greenhouse mitigation technique. The objective of this work was to evaluate the effect of biochar, produced of Gliricidia, on the physical and chemical quality of the soil in Seropédica, from July 2017 to July 2018. The biochar was incorporated to the Solonetz under a coqueiral in Seropédica. The experimental design was a randomized complete block design in a factorial scheme, with the factors with and without application of biochar (10 t ha-1), with 12 replicates in each treatment. pH, P, Ca, Mg, Al + 3, H + Al, K, Na, Cu, COT, M.O at depths 0-5, 5-10, 10-20cm were evaluated at three months intervals. The soil physical property analyzed was the water retention at powers 0, 60, 100, 330 and 1500 kPa. The use of bio-carbon as a soil conditioner increased the water retention and total organic carbon contents in the 0-5 cm depth, increasing the organic matter content. The use of biochar as a soil conditioner did not significantly increase pH, water retention and total organic carbon content and CTC. However, it is noted that biochar can be promising to increase soil carbon and consequently mitigate the greenhouse effect.