Abstract
This paper suggests that willow production, which is one of the generation biomass yields, leads to more utilization of methane fermentation digestive liquid and abandoned farmlands In terms of environmental assessments which are energy profit ratio and Greenhouse gas (GHG) emission, it achieves high production efficiency and has sustainability as energy crop with comparative analysis between Present Case (PC) and Scenario Case (SC) which the willows will be produced and utilized as heat resources in the future. Furthermore, in view of the production process as well as the assessments, willow production calendar is compared to rice production calendar. In the result, it is suggested that labor competition among between the two productions because they don't overlap their on-season and off-one each other..
