To achieve sustainable energy crop production, energy crops should not compete for land against feed and food crops. One option for sustainable energy‐crop cultivation is the use of double cropping systems with minimum tillage use and digestate as natural fertilizer, where, in the same growing season, a second crop for biomethane production is planted after a first crop used for feed/food. Different sorghum phenotypes were evaluated in the present study as first and second crops in a double cropping system. A principal component analysis of the various sorghum phenotypes showed that starch content positively affected methane production. However, sorghum chemical composition did not influence the profitability of bioenergy production as much as the total solid biomass yields of the different sorghum phenotypes. The highest total solid biomass productive sorghum phenotype led to the highest methane hectare yield. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd

中文翻译：

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迈向可持续的能源作物种植：使用具有不同高粱表型的双作物系统生产生物甲烷的可行性

为了实现可持续的能源作物生产，能源作物不应与饲料和粮食作物竞争土地。可持续能源作物种植的一种选择是使用双季耕作系统，以尽量减少耕种和消化的方式将其用作天然肥料，在同一生长季节，在第二季生产生物甲烷的第二季作物将种植在第一季用于饲料/食品的作物之后。 。在本研究中，将不同的高粱表型作为双季种植系统中的第一季和第二季作物进行了评估。对各种高粱表型的主成分分析表明，淀粉含量对甲烷的产生有积极影响。然而，高粱的化学组成并没有像不同高粱表型的总固体生物量产量那样影响生物能源生产的获利能力。最高的总固体生物量生产高粱表型导致最高的甲烷公顷产量。©2020年化学工业协会和John Wiley＆Sons，Ltd