| In this study, the energy use and carbon dioxide (CO2) emission of sweet potato production in Tarlac, Philippines were evaluated. Data were collected from 180 farmers using structured survey questionnaires and face to face interview. Accordingly, the total input and output energy of sweet potato production was 29326.78 and 53885.90 MJ ha-1, respectively. Chemical fertilizers and diesel fuel provided the biggest portion of the total energy consumption in sweet potato production. The energy use efficiency, specific energy and energy productivity was 1.84, 1.95 MJ kg-1 and 0.51 kg MJ-1. Indirect and non-renewable forms of energy dominated the share of the total input energy. The total GHG emission of sweet potato production was 1432.18 kg CO2eq ha-1 (0.095 kg... |
