Energy efficiency and water use indices for sweet potato <i>(Ipomoea batatas</i> L.) production under subtropical climatic conditions of Bangladesh

Abstract To estimate energy use efficiency for sweet potato production in Bangladesh under subtropical climatic conditions, a study was conducted with 60 individuals (12 producers each variety) by using structural questionnaire. The results revealed that the majority of input consumed pre-harvest activities (22,313.55 MJ ha−1 or 90.85%), which fertilizer application (36.84%) and irrigation (35.24%) most input, only 9.15% (2,248.42 ha−1) post-harvest activity production. involved system similar to direct (12,149.76 49.47%) indirect (12,412.21 50.53%) sources, while it much higher non-renewable sources (22,884.21 93.17%) minimum (1,677.76 6.83%) from renewable sources. average efficiency, productivity, specific energy, net profitability water-energy productivity orange-fleshed (OFSP) varieties 4.36, 1.22 kg MJ−1, 0.83 kg−1, 82,511.73 ha−1, 3.36 1.32 g m−3 respectively. OFSP showed better performance respect all water indicators.