title: Manure and Inorganic Nitrogen Affect Trace Gas Emissions under Semi-Arid Irrigated Corn.
abstract: Dairy manure is often applied to cropped soils as a substitute for inorganic N fertilizers, but the impacts of manure on soil trace gas fluxes, yields, and soil N are uncertain in the semiarid western United States. Soil carbon dioxide (CO-C), methane (CH-C), nitrous oxide (NO-N), and ammonia (NH-N) emissions were monitored using surface chambers from five N treatments: (i) partially composted solid dairy manure (DM) (412 kg N ha), (ii) DM + AgrotainPlus (DM+AP), (iii) enhanced efficiency N fertilizer (SuperU [SU]) (179 kg N ha), (iv) urea (179 kg N ha), and (v) check (no N applied), to determine their effect on growing season (GS) and nongrowing season emissions from a tilled clay loam soil under irrigated, continuous corn production for 3 yr. SuperU and AgrotainPlus contain urease and nitrification inhibitors. Averaged over years, GS soil CO-C emissions were greater for DM and DM+AP than for urea, SU, and check treatments due to the large amount of C added with the manure; CH-C emissions did not vary among N treatments; and NO-N emissions decreased in the order urea = DM = DM+AP > SU > check. AgrotainPlus added to the DM did not reduce NO-N emissions compared with DM. Cumulative NH-N emissions after manure application decreased in the order urea > SU > check, with no significant differences between SU, DM, and DM+AP. Dairy manure provided slow-release N with nitrate intensities lower than urea and NO-N emissions similar to urea. These results highlight the importance of best-management practices such as immediate irrigation after N application and use of urease and nitrification inhibitors to minimize N losses.
authors.forename: Ardell D
authors.initials: AD
authors.lastname: Halvorson
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Del Grosso
authors.forename: Catherine E
authors.initials: CE
authors.lastname: Stewart
mesh_terms: D005308:Fertilizers; D008372:Manure; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen; D009609:Nitrous Oxide; D012987:Soil; D003313:Zea mays
chemical_list: D005308:Fertilizers; D008372:Manure; D009566:Nitrates; D012987:Soil; D009609:Nitrous Oxide; D009584:Nitrogen