title: Arsenic Methylation and its Relationship to arsM Genes Abundance and Diversity in Composting Manure
design: Two independent pilot-scale (2.5 m×1.8 m×0.75 m in length, width and height) pig manure compost piles were set up in Hangzhou, China, containing on average 1750 ± 60 µg kg-1 As (dw, n=3). The first manure compost pile (MC1) was composed of 1,200 kg pig manure and 600 kg sawdust for optimal C/N ratio and water content. The second manure compost pile (MC2) contained 1,200 kg pig manure and 600 kg sawdust mixed with burned rice straw.