Nitrous oxide and nitric oxide emissions and nitrogen use efficiency as affected by nitrogen placement in lowland rice fields

Urea deep placement (UDP) has demonstrated its benefits of saving N fertilizer and increasing nitrogen use efficiency (NUE) and grain yields. However, studies on its environmental impacts, particularly on nitrous oxide (N 2 O) and nitric oxide (NO), are limited. We conducted multi-location field exp...

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Bibliographic Details
Published in:Nutrient cycling in agroecosystems 2018-03, Vol.110 (2), p.277-291
Main Authors: Gaihre, Yam Kanta, Singh, Upendra, Islam, S. M. Mofijul, Huda, Azmul, Islam, M. R., Sanabria, Joaquin, Satter, M. Abdus, Islam, Md. R., Biswas, Jatish Chandra, Jahiruddin, M., Jahan, Md. Sarwar
Format: Article
Language:English
Subjects:
Agriculture
Biomedical and Life Sciences
Crop yield
Drying
Emission measurements
Emissions
Environmental impact
Fertilizers
Field tests
Gas sampling
Grain
Growing season
Life Sciences
Nitric oxide
Nitrogen
Nitrous oxide
Original Article
Oryza
Placement
Recovery
Rice
Rice fields
Seasons
Urea
Wetting
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Summary:Urea deep placement (UDP) has demonstrated its benefits of saving N fertilizer and increasing nitrogen use efficiency (NUE) and grain yields. However, studies on its environmental impacts, particularly on nitrous oxide (N 2 O) and nitric oxide (NO), are limited. We conducted multi-location field experiments in Bangladesh to determine the effects of UDP versus broadcast prilled urea (PU) on N 2 O and NO emissions, NUE, and rice yields. N 2 O and NO emissions were measured from three N fertilizer treatments—no N, UDP, and PU—using automated gas sampling and analysis systems continuously for two rice-growing seasons— Aus (May–August) and Aman (August–December). Fertilizer-induced peaks in N 2 O emissions were observed after broadcast application of PU but were rarely observed after UDP. Total seasonal N 2 O and NO emissions, yield-scaled emissions, and fertilizer-induced emissions were affected by fertilizer treatments and sites. Though nitrogen fertilizer increased emissions significantly over the control, emissions resulting from UDP and PU were similar. Effects of N placement on grain yields and NUE were site- and season-specific. Of the N placement methods, UDP increased grain yields by 13% ( p  
ISSN:1385-1314
1573-0867
DOI:10.1007/s10705-017-9897-z