Ozer Hasan, Ozdemir Naime, Ates Asude, Koklu Rabia, Ozturk Erdem Sinem, Ozdemir Saim
Department of Environmental Engineering, Faculty of Engineering, Sakarya University, Esentepe, 54187 Sakarya, Turkey.
Department of Horticulture, Faculty of Agriculture and Natural Science, Bilecik Seyh Edebali University, 11230 Bilecik, Turkey.
Life (Basel). 2024 Oct 14;14(10):1299. doi: 10.3390/life14101299.
This study explores the production of bio-nutrients from bioactive compound-rich spent coffee grounds (SCG) and biochar (BC) through composting after inoculation with a biological agent and its impact on the growth performance of garden cress and spinach. The SCG was composted with six doses of BC (0, 5, 10, 15, 20, and 25%). The compost with 10% BC exhibited the best maturity, humification, and phytotoxicity index values of dissolved organic carbon (DOC), humification index (E4/E6), and germination index (GI). A metagenome analysis showed that compost starter enhanced the bacterial community's relative abundance, richness, and diversity in SCG and BC treatments. This improvement included increased , which can break down noxious phenolic compounds found in SCG and BC. The BC enriched the compost with phosphorus and potassium while preserving the nitrogen. In plant growth experiments, the total chlorophyll content in compost-treated garden cress and spinach was 2.47 and 4.88 mg g, respectively, which was significantly greater ( ≤ 0.05) than in unfertilized plants and similar to the plants treated with traditional fertilizer. Overall, the results show that the compost of SCG + BC was well-suited for promoting the growth of garden cress and spinach, providing adequate nutrients as a fertilizer for these leafy vegetables.
本研究探讨了在接种生物制剂后，通过堆肥从富含生物活性化合物的咖啡渣（SCG）和生物炭（BC）中生产生物营养素，以及其对水芹和菠菜生长性能的影响。将SCG与六种剂量的BC（0%、5%、10%、15%、20%和25%）进行堆肥。含有10% BC的堆肥在溶解有机碳（DOC）、腐殖化指数（E4/E6）和发芽指数（GI）方面表现出最佳的成熟度、腐殖化程度和植物毒性指数值。宏基因组分析表明，堆肥发酵剂提高了SCG和BC处理中细菌群落的相对丰度、丰富度和多样性。这种改善包括增加了 ，其可以分解SCG和BC中发现的有害酚类化合物。BC在保留氮的同时，使堆肥富含磷和钾。在植物生长实验中，经堆肥处理的水芹和菠菜的总叶绿素含量分别为2.47和4.88 mg/g，显著高于（≤0.05）未施肥的植物，与传统肥料处理的植物相似。总体而言，结果表明，SCG + BC堆肥非常适合促进水芹和菠菜的生长，为这些叶菜类蔬菜提供充足的养分作为肥料。
