www.researchgate.net/publication/...as_production
Abstract, ResearchGate, 2017
Dry climate areas have reduced availability of organic waste − an obvious disadvantage for biogas production. This obstacle can be overcome by developing energy crops well adapted to arid areas. In this context, opuntias − among them, Opuntia cus-indica (L.) Mill. − characterized by crassulacean acid metabolism (CAM), are recommended as an alternative energy source as they have a high potential for biomass production (García de Cortázar and Nobel, 1992; García de Cortázar and Varnero, 1995). Farmers can thus reduce their electricity and gas bills (liqueed petroleum gas, LPG) by producing their own energy, while improving the quality and conditions of the soil by applying the digestate to the elds.