Organic amendment practices as possible drivers of biogenic Volatile Organic Compounds emitted by soils in agrosystems

•Manure fertilizations were associated with living γ-Proteobacteria inoculation to soil.•Pig slurry activated native soil Bacillus sp. but not the methanized pig slurry.•Pig slurry input doubled C-VOC fluxes emitted into the air due to high methanol emissions.•Methanized pig slurry lowered C-VOC fluxes under those of the control plot.•Cropped soil emitted significant amounts of acetonitrile irrespective of manure fertilization.