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Titel |
Nitrous oxide emission and nitrogen use efficiency in response to nitrophosphate, N-(n-butyl) thiophosphoric triamide and dicyandiamide of a wheat cultivated soil under sub-humid monsoon conditions |
VerfasserIn |
W. X. Ding, Z. M. Chen, H. Y. Yu, J. F. Luo, G. Y. Yoo, J. Xiang, H. J. Zhang, J. J. Yuan |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1726-4170
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Digitales Dokument |
URL |
Erschienen |
In: Biogeosciences ; 12, no. 3 ; Nr. 12, no. 3 (2015-02-10), S.803-815 |
Datensatznummer |
250117805
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Publikation (Nr.) |
copernicus.org/bg-12-803-2015.pdf |
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Zusammenfassung |
A field experiment was designed to study the effects of nitrogen (N) source
and urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) or
nitrification inhibitor dicyandiamide (DCD) on nitrous oxide (N2O)
emission and N use efficiency (NUE) in a sandy loam soil. Six treatments
including no N fertilizer (control), N fertilizer urea alone (U), urea plus
NBPT (NBPT), urea plus DCD (DCD), urea plus NBPT and DCD (NBPT plus DCD) and
nitrate-based fertilizer nitrophosphate (NP) were designed and implemented
separately during the wheat growth period. Seasonal cumulative N2O
emissions with urea alone amounted to 0.49 ± 0.12 kg
N2O-N ha−1 and were significantly (P < 0.05) reduced to
0.28 ± 0.03, 0.31 ± 0.01 and 0.26 ± 0.01 kg
N2O-N ha−1 by application of DCD, NBPT and NBPT plus DCD,
respectively. Cumulative N2O emissions from NP were
0.28 ± 0.01 kg N2O-N ha−1. A single N2O flux peak was
identified following basal fertilization, and DCD and/or NBPT inhibition
effects mainly occurred during the peak emission period. The NP application
significantly (P < 0.05) increased wheat yield by 12.3% and NUE
from 28.8% (urea alone) to 35.9%, while urease and/or nitrification
inhibitors showed a slight increase effect. Our results clearly indicated
that the application of urea as basal fertilizer, but not as supplemental
fertilizer, together with DCD and NBPT is an effective practice to reduce
N2O emissions. The application of NP instead of urea would be an optimum
agricultural strategy for reducing N2O emissions and increasing crop
yield and NUE for wheat cultivation in soils of the North China Plain. |
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