Advances in research on the comprehensive utilization of a perennial grass Pennisetum hydridum.
Because of its biological characteristics of large biomass, fast growth, and strong resistance, Pennisetum hydridum has raised public concern in recent years. In this review, the recent advances and applications of P. hydridum in the fields of ecological environment, livestock feedstuff, bioenergy, and other aspects are summarized, which could benefit the comprehensive utilization of P. hydridum biomass resources. The results demonstrated the importance of P. hydridum for remediating degraded soil, purifying sewage, and controlling invasive species; therefore, heavy metals, nitrogen and phosphorus, and invasive species can be effectively removed by P. hydridum. The main approaches for forage utilization are green fodder, hay, ammonification, and ensiling. Among these, ensiling achieves a balanced nutrition and alleviates deficiencies in livestock during spring and winter. Pyrolysis and combustion, biogas fermentation, and bioethanol fermentation convert P. hydridum to bioenergy. Biomass and cellulose content are the key factors affecting the energy utilization potential and are the basis for developing fiberboard, nanocellulose membrane, and edible fungus culture medium. Finally, this study analyzed the existing problems in current studies, emphasizing the optimization of technology and expanding the utilization approaches of P. hydridum biomass resources in the future. A comprehensive utilization mode of biomass resource of P. hydridum was introduced, including using this harvested environmental phytoremediation material as a high-quality forage, energy plant, as well as a source of other industrial products, thus changing waste residue into organic fertilizer.