Sweet sorghum seems to be one of the most promising energy crops for a wide range of ecological conditions thanks to its high yield potential and drought tolerance. A two-year field trial was conducted in a semi-arid Mediterranean environment in Turkey to evaluate the interactive effects of different nitrogen fertilizer levels (100, 150, and 200 kg ha⁻¹) and humic substances (0, 15, 30, and 45 L ha⁻¹) applications on the biomass and bioethanol yields of sweet sorghum, and combustion characteristics of its bagasse. Sweet sorghum showed a positive response to increased nitrogen fertilizer and humic subtances application levels in terms of biomass and bioethanol production. Lignocellulosic and total bioethanol yields significantly increased up to 2910 and 3336.6 L ha⁻¹ as a result of the combined application of the 200 kg ha⁻¹ N and 15 L ha⁻¹ humic subtances (HS), respectively. However, HS application had a detrimental effect on the bagasse combustion quality, because it caused a considerable increase in the mineral and ash concentrations. Briefly, combined application of 200 kg ha⁻¹ N and 15 L ha⁻¹ HS may be suggested to be applied for the sustainable bioethanol production from sweet sorghum, while the application of HS likely does not provide any economic and environmental benefit if bagasse would be used as solid biofuel feedstock.

中文翻译：

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氮与腐殖质的交互作用对甜高粱生产生物乙醇及其甘蔗渣燃烧特性的影响

甜高粱由于具有很高的单产潜力和耐旱性，因此似乎已成为各种生态条件下最有希望的能源作物之一。在土耳其半干旱的环境中进行了为期两年的田间试验，以评估不同氮肥水平（100、150和200 kg ha ^-1）和腐殖质（0、15、30和45 L ha ^-1）应用于甜高粱的生物量和生物乙醇产量及其甘蔗渣的燃烧特性。甜高粱在生物量和生物乙醇产量方面对氮肥和腐殖质施用量增加表现出积极的反应。木质纤维素和总生物乙醇产量显着提高，最高可达2910和3336.6 L ha ^-1分别施用200 kg ha ^-1 N和15 L ha ^-1腐殖质（HS）的结果。但是，HS施用对甘蔗渣燃烧质量有不利影响，因为它引起矿物质和灰分浓度的显着增加。简而言之，可建议将200 kg ha ^-1 N和15 L ha ^-1 HS的联合施用用于甜高粱的可持续生物乙醇生产，而如果甘蔗渣将对HS的施用可能不会带来任何经济和环境效益。用作固体生物燃料原料。