Effect of fertilizer application mode on edaphon in black soil in Songnen Plain

Field experiment was conducted to research the effect of manure and chemical fertilizer on the number of nitrogen transferrer edaphon(e.g.aerobic nitrogen-fixing bacteria, ammonifiers,nitrite bacteria and denitrifying bacteria) in black soil ecosystems.Results show that application of manure increase the number of aerobic nitrogen-fixing bacteria, ammonifiers and denitrifying bacteria, while chemical fertilizers reduce the number of aerobic nitrogen-fixing bacteria in black soils, increase the number of denitrifying bacteria.Otherwise combination of equally proportioned manure and chemical fertilizer promotes aerobic nitrogen-fixing bacteria, nitrite bacteria and denitrifying bacteria activities.