Secuestro de Carbono en suelos cultivados con cacao nacional en la parroquia Progreso.

Abstract

With the aim of quantifying the carbon sequestration in soils of the order Inceptisol cultivated with Theobroma cacao L. National type at different depths and compare with a fallow soil. Three parcels were delimited in Progreso parish, Pasaje-Ecuador canton, two in the cultivation of cacao and one in fallow. The samples were taken on a 30 meter transept at 0-15-30 m, extracting the soil at three depths (0-10, 10-20 and 20-40 cm), a process that was repeated in the three plots. The analytical determinations were: apparent density (Da) by cylinder method, proportions of clay, silt and sand by Bouyoucos, pH (ratio 1:25) and organic matter (MO) by Walkey Black. The results showed a predominance of sand with values between 50-65% in the three plots, related the Da ranges (1.38-1.59 g-1m3) with the sandy loam textures classes for cocoa and sandy clay loam for the fallow ground. The pH ranges in the soil were practically neutral (pH 673-6.75) in cocoa and acid (pH 4.77-4.83) for fallow use. Soil OM levels were high (4.67%) from 0 to 10 cm for cocoa use, which fell in their profile in order to obtain records below ≤0.75% as fallow land. The highest recorded C in use was 36.78 Mg ha-1in the first cocoa substrate, followed by 18.75 Mg ha-1 and 28.66 Mg ha-1in the second and third depth, while in fallow the highest value of 8.39 Mg C ha-1in the stratum 20-40 cm, results that contain significant differences between the land uses and the depths at which the samples were taken, affecting the biomass generated by the cultivate cocoa in the levels of C.