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This research is oriented towards determining the size and energy potential of a system of biodigesters installed in six livestock production systems, which are in the provinces of Sumapaz and Ubaté, in Cundinamarca Department, Colombia. Thus, the existing animal species in the scenario are determined, since they will contribute organic waste to the biodigester; the number of animals is also determined, considering the herd movement, which would make it possible to determine the biomass generated daily with the purpose of establishing the sizing of the appropriate biodigester technology and to know the behavior of the energy parameters. Among the main results obtained, it was evidenced that the biomass generated daily was not considered for the dimensioning and establishment of the polyethylene tubular biodigesters. In addition, the biodigesters installed in the production systems at La Meseta and El Tibar are oversized by 4,8 and 1,6 times, respectively; aspect that evidences the need to increase the daily biomass generated, which is achievable by increasing of animals in the herd. The biodigesters installed in the production systems at Santa Bárbara, El Mirador, La Saucita and La Esperanza, demonstrate an under-sizing, with inferiority values of 2,9; 1,97; 1,49; 2,04 times. These results indicate that, in these scenarios, the total number of animals used for biomass production is greater than that required with respect to the installed biodigester or that the installed biodigesters cannot take advantage of the biomass generated daily. [ABSTRACT FROM AUTHOR]

The climatic variations make difficult to plan activities in agricultural systems, it is necessary to update the knowledge of local climate conditions. This study analyzes the climatic variability of relevant agricultural regions in Boyacá and Cundinamarca. Modeling behaviors of climatic variables of agricultural interest are identified, likewise, the intra-annual analysis of extreme events is carried out and areas with water deficiencies and excesses are identified through a hydroclimatic balance. Finally, areas with greater frequency of deficiencies and water excess conditions in soil were identified on a monthly basis by index of the Palmer Drought Severity Index (PSDI). The results indicate that the two zones of study do not show great climatic differences between them, however, it is important to carry out separately study of them looking for provide local useful information for producers. Saboyá in the Ubate Valley and Chiquinquirá and Sotaquirá in the Alto Chicamocha were affected by both, deficiency and excess, water events. The 1997 El Niño event had a stronger impact in the Ubaté Valley and Chiquinquirá area. Moreover, Alto Chicamocha region showed the biggest rainfall reduction registered in 1992, which matchs with an El Niño event. In terms of excess water, 2011 perceived rainfall increases of more than 50% in those two regions, this behavior responded to La Niña event that year. [ABSTRACT FROM AUTHOR]