Assessing the overall impact of biomass on water resources can provide guidance for biomass fuel production and water resource protection. The life-cycle water footprint (WF) of five typical crops (hemp, corn, soybean, sugarcane and cassava) in Bama, converted to bio-ethanol was analyzed using CROPWAT 8.0 model, combined with environmental and economic assessment. The calculation results showed that cassava and sugarcane straw were the best feedstocks for biomass fuel production with the lowest life-cycle WF (93-1732 m/t). Hemp straw to bio-ethanol had highest life-cycle WF (40066-52,895 m/t) and water pressure (K = 0.32). The economic output value per unit area of sugarcane was greater than that of other crops, which is 10 times that of corn. Corn consumes more water than any other crop annually, rising from 230 million cubic meters to 245 million cubic meters. The economic value of sugarcane is the highest, and it shows an increasing trend year by year, reaching a maximum of 1.76 RMB/m in 2022. The results could guide the Bama administration's efforts to cultivate crops with lower water footprints or higher economic benefits, and also contribute to the efficient use of water resources.
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