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in the soil, two dairy units of 60 ha each were studied for three years. These facilities are located in the Institute of Animal Science, Cuba. The carbon stored in the soil (CSS, t C ha-1) was calculated using the percent of C in the soil (% CS), the apparent density (AD) and depth of the sampling (D). The evaluation was made in 30 % of the total area of each dairy unit, which is the surface occupying the biomass bank. The CSS oscillated between 38 and 60 t ha-1 in the depth from 0 to 30 cm. There was a significant raise in the CSS due to the increase of the exploitation time of each biomass bank, which was 9 and 5 years for A and B dairies, respectively. The dairy unit A had higher values: 60.55 t ha-1 from 0 a 15 cm and 28.8 t ha-1 from 15 to 30 cm. It can be concluded that the technology of the biomass bank with CT-115 in ferralitic and brown soils, properly used, can be a way to increase the carbon storage in the soil, at the same time that the exploitation time increases. Along with the use of this technology, the CSS values are higher than the ones informed as average for tropical grass. Further studies in order to determine the total amount of carbon stored in the system using this technology are recommended.
Key words: carbon storage, soil, biomass bank, CT-115.
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