An innovative formulation to improve spent coffee characteristics as soil fertilizer: Nutrient, chemical characterization and effects on plant germination

IF 3.4 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biocatalysis and agricultural biotechnology Pub Date : 2024-10-01 DOI:10.1016/j.bcab.2024.103394

Simone Angeloni , Giovanni Caprioli , Marco Cespi , Laura Acquaticci , Ahmed M. Mustafa , Agnese Santanatoglia , Aldo D'Alessandro , Martina Coletta , Natasha Waris , Antonietta La Terza

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Abstract

Spent coffee grounds (SCG) possess high organic content and various essential nutrients. However, their direct use as a fertilizer is limited due to high acidity, phenolic content, and C/N ratio. Therefore, in this study, SCG-based fertilizer (SCG_f) was developed by mixing the raw SCG (SCG_r) and zein through a granulation process and was compared with the SCG_r. According to the obtained results, in SCG_f, a reduction in the C/N ratio from 22.9 to 10.9, improved flowability from fair to good, an increase in the concentration of elements (N, C, S), nutrients (ash, fats, proteins), macrominerals (Ca, Mg, P, K, Na), microminerals (Cu, Fe, Mn, Zn), total polyphenolic content (TPC), total flavonoid content (TFC), and antioxidant activities (AOA) was noted. Additionally, a decrease in total organic acids, total chlorogenic acids, and was also observed in SCG_f. Regarding phytotoxicity test results obtained by using Sinapis alba, Sorghum saccharatum, and Lepidium sativum and treating them with 2.5%, 5%, and 10% of SCG_f and SCG_r, better germination was observed for SCG_f in S. alba (5%, 10%), L. sativum (2.5%, 5%). However, in L. sativum, 5% of SCG_r and 10% of both SCG_r and SCG_f completely inhibited seed germination. For S. saccharatum, higher germination rates were observed for SCG_f (2.5%, 10%), and at 5%, a comparable effect of both SCG_f and SCG_r was noted. SCG_f gave the longest root length at all concentrations in all plants except for 2.5% in S. alba. In conclusion, this study addresses the effective use of SCG for sustainable agriculture while mitigating environmental impacts.

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改善咖啡渣作为土壤肥料特性的创新配方：养分、化学特性及对植物发芽的影响

废弃咖啡渣（SCG）具有很高的有机含量和各种必需的营养成分。然而，由于其酸度、酚含量和碳氮比较高，直接用作肥料受到限制。因此，在本研究中，通过造粒工艺将未加工的咖啡渣（SCGr）与玉米蛋白混合，开发出了基于咖啡渣的肥料（SCGf），并与 SCGr 进行了比较。结果表明，SCGf 的碳氮比从 22.9 降至 10.9，流动性从一般提高到良好，元素（氮、碳、硒）、养分（灰分、脂肪、蛋白质）、大矿物质（钙、镁、磷、钾、鈉）、小矿物质（铜、铁、锰、锌）、总多酚含量（TPC）、总黄酮含量（TFC）和抗氧化活性（AOA）的浓度均有所提高。此外，在 SCGf 中还观察到总有机酸、总绿原酸和抗氧化活性降低。使用白花蛇舌草、糖高粱和莴苣并用 2.5%、5% 和 10%的 SCGf 和 SCGr 处理后，植物毒性试验结果表明，SCGf 在白花蛇舌草（5%、10%）和莴苣（2.5%、5%）中的发芽率更高。然而，在 L. sativum 中，5% 的 SCGr 和 10%的 SCGr 及 SCGf 都会完全抑制种子萌发。对于 S. saccharatum，SCGf（2.5%、10%）的发芽率较高，在 5%的发芽率下，SCGf 和 SCGr 的效果相当。在所有浓度下，SCGf 的根长都是最长的，只有 2.5% 的 S. alba 除外。总之，这项研究探讨了如何在可持续农业中有效使用 SCG，同时减轻对环境的影响。

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来源期刊

Biocatalysis and agricultural biotechnology Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

7.70

自引率

2.50%

发文量

308

审稿时长

48 days

期刊介绍： Biocatalysis and Agricultural Biotechnology is the official journal of the International Society of Biocatalysis and Agricultural Biotechnology (ISBAB). The journal publishes high quality articles especially in the science and technology of biocatalysis, bioprocesses, agricultural biotechnology, biomedical biotechnology, and, if appropriate, from other related areas of biotechnology. The journal will publish peer-reviewed basic and applied research papers, authoritative reviews, and feature articles. The scope of the journal encompasses the research, industrial, and commercial aspects of biotechnology, including the areas of: biocatalysis; bioprocesses; food and agriculture; genetic engineering; molecular biology; healthcare and pharmaceuticals; biofuels; genomics; nanotechnology; environment and biodiversity; and bioremediation.