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Manure and Inorganic Nitrogen Affect Trace Gas Emissions under Semi-Arid Irrigated Corn

Manure and Inorganic Nitrogen Affect Trace Gas Emissions under Semi-Arid Irrigated Corn

Authors :
Stephen J. Del Grosso
Catherine E. Stewart
Ardell D. Halvorson
Source :
Journal of Environmental Quality. 45:906-914
Publication Year :
2016
Publisher :
Wiley, 2016.

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.

Details

ISSN :
00472425
Volume :
45
Database :
OpenAIRE
Journal :
Journal of Environmental Quality
Accession number :
edsair.doi.dedup.....55aebdc4b6e1b1d613a656b933410ce9
Full Text :
https://doi.org/10.2134/jeq2015.08.0426