Incorporation and harvest management of hairy vetch-based green manure influence nitrous oxide emissions

In this study, we measured nitrous oxide (N 2 O) emissions from plots of fall-planted hairy vetch (HV, Vicia villosa ) grown as a green nitrogen (N) source for following summer forage crabgrass ( Digitaria sanguinalis ). Two treatments were compared: (i) HV grown solely as green manure where all biomass was incorporated by tillage, and (ii) harvesting of aboveground HV biomass prior to planting of crabgrass. Fluxes of N 2 O were measured with...