Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu, China.
College of Resources and Environment, Chengdu University of Information Technology, Chengdu, China.
J Sci Food Agric. 2021 Feb;101(3):927-936. doi: 10.1002/jsfa.10700. Epub 2020 Aug 21.
A large number of digestates have not been fully utilized due to a lack of scientific, reasonable guidance, as well as imperfect technology. Hybrid giant Napier has great potential for use as a type of energy plant. As such, this study investigated the effects of digestate on the growth of a candidate energy crop and examined whether digestate was an ecologically viable means for soil restoration.
The results showed that the total yields of all treatment groups receiving irrigation of digestate were higher (5.19-26.00%) than those of the control. The total phosphorus, total potassium, available nitrogen, available phosphorus, and available potassium content of the soil had also increased after digestate application, compared with the control. Urease activities for all treatments increased 15.28 to 69.44% more than that of the corresponding control. Soil dissolved organic matter (DOM) mainly contained humic-like and fulvic-like components through the application of digestate. More fluorescent components were also identified by two-dimensional correlation spectroscopy (2D-COS). These fluorescent components can improve the aromaticity and molecular weight of soil DOM so as to improve soil quality.
Digestate improved not only the aboveground biomass accumulation, but also the chemical properties of the soil, which was an appropriate strategy for restoring soil quality and contributing to the sustainable development of marginal. The long-term impact of digestate application on soil quality will require additional long-term experiments. © 2020 Society of Chemical Industry.
由于缺乏科学合理的指导以及不完善的技术，大量的消化残渣尚未得到充分利用。杂交巨象草作为一种能源植物具有很大的应用潜力。因此，本研究探讨了消化残渣对候选能源作物生长的影响，并研究了消化残渣是否是一种生态上可行的土壤修复方法。
结果表明，所有接受消化残渣灌溉的处理组的总产量（5.19-26.00%）均高于对照组。与对照组相比，施用消化残渣后土壤的总磷、总钾、有效氮、有效磷和有效钾含量也有所增加。与相应的对照相比，所有处理的脲酶活性均增加了 15.28%至 69.44%。通过施用消化残渣，土壤溶解性有机质（DOM）主要含有腐殖质样和富里酸样成分。二维相关光谱（2D-COS）还鉴定出更多的荧光成分。这些荧光成分可以提高土壤 DOM 的芳香度和分子量，从而提高土壤质量。
消化残渣不仅提高了地上生物量的积累，而且改善了土壤的化学性质，这是一种恢复土壤质量和促进边缘可持续发展的适当策略。消化残渣应用对土壤质量的长期影响需要进行更多的长期实验。© 2020 英国化学学会。
