Fig. 2. Subtraction spectra (DR-FTIR) representing (a) 865–1825 cm^-1 region: changes in sawdust-bedded cow manure compost composition during the composting process (A); changes in compost-derived POM composition during decomposition in sand (Day 83 minus Day 506) (B); (b) 3015–2805 cm^-1 Aliphatics region: changes in sawdust-bedded cow manure compost composition during the composting process (A); changes in compost-derived POM composition as suppression is supported during decomposition in sand (Day 83 minus Day 391) (B); changes in compost-derived POM composition as suppression is lost during decomposition in sand (Day 391 minus Day 506) (C)