ABSTRACT The different organic matter fractions of residues significantly impact the degradability of organic material in composting windrows. Based on that, this study aimed to find out the organic matter fractions that most impact the breakdown rate during composting, besides proposing models to estimate the solids reductions in sheep bedding composting windrows. To that end, 24 sheep beddings from different locations and varied composition were composted so as to ensure the representativeness of the sample. The models found for reduction in total (TS) and volatile (VS) solids as a function of compostable organic matter (COM) and organic matter resistant to composting (OMRC) were not significant. Lignin had correlation coefficients of −0.6, −0.89, and −0.84 in relation to temperature, TS reduction, and VS reduction, respectively. The hemicellulose:lignin ratio was the parameter most correlated with temperature (0.69), TS reduction (0.91), VS reduction (0.92), and nitrogen (0.5), which led to more significant predictive models. It can be concluded that the hemicellulose:lignin ratio is the parameter that most impacts the breakdown of organic matter and nitrogen losses in sheep bedding composting windrows.

中文翻译：

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羊垫料堆肥过程中固体含量的估计减少与有机部分组成的关系

摘要 残渣的不同有机物比例显着影响堆肥堆肥中有机材料的降解性。在此基础上，本研究旨在找出对堆肥过程中分解率影响最大的有机物质部分，此外还提出了估算羊垫料堆肥堆中固体减少量的模型。为此，对来自不同地点和不同成分的 24 只羊垫料进行了堆肥，以确保样品的代表性。发现的总固体 (TS) 和挥发性 (VS) 固体减少与可堆肥有机物 (COM) 和抗堆肥有机物 (OMRC) 相关的模型并不显着。木质素与温度、TS 减少和 VS 减少的相关系数分别为 -0.6、-0.89 和 -0.84。半纤维素:木质素比率是与温度 (0.69)、TS 减少 (0.91)、VS 减少 (0.92) 和氮 (0.5) 最相关的参数，这导致了更重要的预测模型。可以得出结论，半纤维素：木质素比率是对羊垫料堆肥堆肥中有机物分解和氮损失影响最大的参数。