Compost extract or "compost tea" is a liquid extract of compost obtained by mixing compost and water for a defined period of time. Compost tea contains nutrients and a range of different organisms and is applied to the soil or directly to plants with the principal aim of suppressing certain plant diseases. In addition, the application of compost tea supplies nutrients and organic matter to the soil. Thermal analysis and Fourier transform infrared spectroscopy (FTIR) are two widely applied analytical techniques for establishing the stability of compost, and although numerous studies have evaluated the capacity of compost tea to suppress plant diseases, there are no studies employing these techniques to characterize compost-tea. For the present study, 12 compost extracts were produced under varying conditions in a purpose-built reactor. Two different composts, an stable compost produced from manure and an unstable compost produced from municipal solid waste, respectively, two aeration systems (aerated and non-aerated extracts) and three temperatures (10, 20 and 30 degrees C) were used in these experiments. The extracts were freeze-dried and subsequently analysed, together with the two composts, by means of FTIR and thermal analysis. Extracts produced from high stability compost, independently of the conditions of aeration and temperature, showed very similar results. In contrast, differences among extracts produced from the unstable compost were more noticeable. However, the different conditions of aeration and temperature during the production of the extracts only explained partially these differences, since the transformations undergone by compost over the 3 months that the experiments lasted were also reflected in the composition of the extracts. In spite of everything, extraction process favoured the degradation of easily oxidizable organic matter, which was more abundant in unstable compost. This degradation was more intense for non-aerated processes, probably due to the longer duration of these (10 days) with respect to aerated extractions (2 days). The effect of temperature was not clear in these experiments, although high temperatures could increase micro organism activity and consequently favour the degradation of easily oxidizable organic matter.

中文翻译：

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使用傅里叶变换红外光谱（FTIR）和热分析表征不同的堆肥提取物。

堆肥提取物或“堆肥茶”是堆肥的液体提取物，其是通过将堆肥和水混合一段确定的时间而获得的。堆肥茶含有营养成分和多种不同的生物，可用于土壤或直接用于植物，其主要目的是抑制某些植物疾病。此外，堆肥茶的应用为土壤提供了营养和有机物质。热分析和傅里叶变换红外光谱（FTIR）是建立堆肥稳定性的两种广泛应用的分析技术，尽管许多研究评估了堆肥茶抑制植物病害的能力，但尚无研究使用这些技术来表征堆肥的特性。茶。对于本研究，在专用反应器中，在不同条件下生产了12种堆肥提取物。在这些实验中，分别使用了两种不同的堆肥，一种是由粪肥产生的稳定堆肥，另一种是由城市固体废物产生的不稳定堆肥，两种曝气系统（充气和非充气提取物）和三种温度（10、20和30摄氏度） 。将提取物冷冻干燥，然后通过FTIR和热分析与两种堆肥一起进行分析。由高稳定性堆肥生产的提取物，与曝气和温度条件无关，显示出非常相似的结果。相反，不稳定堆肥产生的提取物之间的差异更为明显。但是，提取物生产过程中曝气和温度的不同条件只能部分解释这些差异，因为在持续了3个月的时间内堆肥进行的转化也反映在提取物的组成中。尽管如此，萃取过程还是有利于易氧化有机物的降解，而易氧化有机物在不稳定的堆肥中含量更高。对于非充气过程，这种降解更为严重，这可能是由于这些过程相对于充气萃取（2天）的持续时间更长（10天）。在这些实验中，温度的影响尚不清楚，尽管高温会增加微生物的活性，因此有利于易氧化有机物的降解。在不稳定的堆肥中含量更高。对于非充气过程，这种降解更为严重，这可能是由于这些过程相对于充气萃取（2天）的持续时间更长（10天）。在这些实验中，温度的影响尚不清楚，尽管高温会增加微生物的活性，因此有利于易氧化有机物的降解。在不稳定的堆肥中含量更高。对于非充气过程，这种降解更为严重，这可能是由于这些过程相对于充气萃取（2天）的持续时间更长（10天）。在这些实验中，温度的影响尚不清楚，尽管高温会增加微生物的活性，因此有利于易氧化有机物的降解。