Effect of Manure Treatment on Ammonia and Greenhouse Gases Emissions Following Surface Application

摘要

A 3-year study was conducted to determine the effects of anaerobic digestion (AD), large particle solids, and manure additive (More Than Manure, MTM~(TM) ) on ammonia (NH_3) and greenhouse gas (GHG; carbon dioxide, nitrous oxide, and methane) emissions when raw and treated manure were surface-applied. The presence of large particle solids resulted in greater NH_3 emissions, probably, due to reduced infiltration of liquid manure into soil (P＜0.05). Anaerobic digestion did not have a consistent effect on NH_3 emission. Manure with greater ammoniacal nitrogen (AN) concentrations had significantly greater NH_3 loss after manure application (P＜0.05). Anaerobic digestion of manure also did not have a significant effect on GHG flux (P＞0.05). Raw manure with large particle solids had significantly greater CO_2 flux than the other raw manure treatments on the day of manure application (P＜0.05). There was no significant manure treatment effects (P＞0.2) on methane flux over the 3-day period after manure application. The manure additive MTM~(TM) did not have significant effects (P＞0.05) on NH_3 and GHG fluxes. The results of this study suggest that solids and AN concentrations in manure are the most important factors affecting NH_3 emissions after surface application.