Organic amendment is important for promoting soil quality through increasing soil fertility and soil microbes. This study evaluated the effectiveness of using liquid food waste material (LFM) as a microbial resource, by analyzing the microbial community composition in LFM, and by isolating plant growth-promoting bacteria (PGPB) from the material. High-throughput sequencing of LFM, collected every month from May to September 2018, resulted in the detection of >1000 bacterial operational taxonomic units (OTUs) in the LFM. The results showed that Firmicutes was abundant and most frequently detected, followed by Proteobacteria and Actinobacteria. Of the culturable strains isolated from LFM, almost all belonged to the genus Bacillus. Four strains of PGPB were selected from the isolated strains, with traits such as indole acetic acid production and 1-aminocyclopropane-1-carboxylic acid deaminase activity. Lettuce growth was improved via LFM amendment with PGPB, and Brassica rapa showed significant differences in root biomass when LFM amendment was compared with the use chemical fertilizer. Field experiments using LFM showed slight differences in growth for Brassica rapa, lettuce and eggplant, when compared with the use of chemical fertilizer. LFM is a useful microbial resource for the isolation of PGPB, and its use as fertilizer could result in reduced chemical fertilizer usage in sustainable agriculture.

中文翻译：

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农业对未利用资源的利用：液态食物废料作为促进植物生长的微生物的新来源

有机改良剂通过增加土壤肥力和土壤微生物对于提高土壤质量非常重要。这项研究通过分析LFM中的微生物群落组成以及从该材料中分离出促进植物生长的细菌（PGPB），评估了将液态食品废料（LFM）用作微生物资源的有效性。从2018年5月至2018年9月每个月收集LFM的高通量测序结果，从而在LFM中检测出> 1000个细菌操作分类单位（OTU）。结果表明，Firmicutes丰富并且最常被发现，其次是Proteobacteria和Actinobacteria。从LFM分离的可培养菌株中，几乎全部属于芽孢杆菌属。。从分离的菌株中选出四株PGPB，它们具有吲哚乙酸的产生和1-氨基环丙烷-1-羧酸脱氨酶的活性。通过使用PGPB进行LFM改良剂可以改善生菜的生长，并且当将LFM改良剂与使用化肥进行比较时，甘蓝型 油菜显示出根系生物量的显着差异。使用LFM的田间试验表明，与使用化肥相比，芸苔，生菜和茄子的生长略有不同。LFM是分离PGPB的有用微生物资源，其用作肥料可能导致可持续农业中化学肥料的使用减少。