Volcanic soils denominated Andosols cause direct damages to the radicular system of crops, because of the Aluminum soils levels and the blockage in the transport of elements such as Calcium and Phosphorus to the aerial part of the plant, the effects are neutralized witch the applications of lime with Calcium carbonate (CaCO ). The aim of the study was to Evaluate the effects of applying different doses of Calcium carbonate to the soil on the chemical characteristics: pH, phosphorus availability, exchangeable Aluminum, Calcium availability, and Cation exchange capacity. The research was developed in Popayan and Calibio from May to October 2005. In a complete randomized block design with four blocks, four treatments were allocated (T0: (no applications); T1: 1 Ton CaCO3.ha-1 ; T2: 2 Ton CaCO3.ha-1 and T3: 3 Ton CaCO3.ha-1). Phosphorus availability, Calcium availability and exchangeable aluminum showed significant differences (p< 0.05). T1 presented low level of phosphorus availability (6.0 ppm) 60 days after the CaCO application; T3 presented the highest levels of Calcium availability (12.1 and 4.8 meq/100 g) 30 and 60 days after the CaCO3 application respectively. For exchangeable Aluminum the lowest values (0.4 y 0.5 meq /100 g) were found in T3 30 and 120 days after the application of CaCO3. There were no significant differences in pH and CEC during the time of evaluation.