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首页> 外文期刊>Journal of Material Cycles and Waste Managemen >Comparative fertilizer properties of digestates from mesophilic and thermophilic anaerobic digestion of dairy manure: focusing on plant growth promoting bacteria (PGPB) and environmental risk
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Comparative fertilizer properties of digestates from mesophilic and thermophilic anaerobic digestion of dairy manure: focusing on plant growth promoting bacteria (PGPB) and environmental risk

机译：乳肥料中温和高温厌氧消化消化物的肥料特性比较：关注植物生长促进细菌（PGPB）和环境风险

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摘要

The fertilizer properties of anaerobic digestate depend on the feedstock and operating conditions of digestion. In this study, the comparative fertilizer properties of mesophilic and thermophilic digestates from dairy manure were evaluated for plant nutrient contents, and special attention was paid to plant growth promoting bacteria (PGPB). Two digestates contained similar plant nutrient contents, while the thermophilic digestate contained higher contents of NH4 (+)-N. The quantity of Bacillus and Pseudomonas in the mesophilic digestate was significantly higher than in the thermophilic digestate. Furthermore, Bacillus showed siderophore production and antifungal activity (43.5-75.3%), and Pseudomonas showed siderophore and phytohormone production (4.2-75.2 A mu g ml(-1)). One phosphate solubilizing isolate was also detected in the mesophilic digestate. These results indicated that two digestates showed different fertilizer properties with respect to nutrient contents and PGPB, and digestates had the potential to increase the availability of phosphorus and iron in the soil, both to provide phytohormones to plant roots and protect plants from fungal phytopathogens. The contents of indicator bacteria and heavy metals were analyzed to determine their environmental risk, and the results showed a high reduction in indicator bacteria and lower levels of heavy metals than in other feedstocks.
机译：厌氧消化物的肥料特性取决于消化的原料和操作条件。在这项研究中，对乳牛粪中温和高温消化液的比较肥料特性进行了植物营养成分评估，并特别注意了促进植物生长的细菌（PGPB）。两种消化物含有相似的植物养分含量，而嗜热消化物含有较高含量的NH4（+）-N。中温消化液中芽孢杆菌和假单胞菌的数量显着高于嗜热消化液中。此外，芽孢杆菌显示出铁载体和抗真菌活性（43.5-75.3％），假单胞菌显示出铁载体和植物激素的产生（4.2-75.2 Aμg ml（-1））。在嗜温消化物中还检测到一种可溶解磷酸盐的分离物。这些结果表明，两种消化物在养分含量和PGPB方面表现出不同的肥料特性，并且消化物具有增加土壤中磷和铁的利用率的潜力，既可以为植物根提供植物激素，又可以保护植物免受真菌性植物病原菌的侵害。对指示剂细菌和重金属的含量进行了分析，以确定它们的环境风险，结果表明，与其他原料相比，指示剂细菌的高度减少和重金属的含量较低。

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