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Integrated Organic-Inorganic Nitrogen Fertilization Mitigates Nitrous Oxide Emissions by Regulating Ammonia-Oxidizing Bacteria in Purple Caitai Fields.
- Source :
- Agriculture; Basel; May2022, Vol. 12 Issue 5, p723, 15p
- Publication Year :
- 2022
-
Abstract
- Purpose Nitrogen (N) fertilizer application in agricultural soil is a primary anthropogenic nitrous oxide (N<subscript>2</subscript>O) source. Currently, the effect of the N fertilizer type on N<subscript>2</subscript>O emissions from upland soil has been rarely reported. To this end, impacts of various types of N fertilizer on N<subscript>2</subscript>O emissions in purple caitai (Brassica campestris L. ssp. chinensis var. purpurea) fields are investigated in this work. The field experiment was carried out with four treatments, including inorganic N fertilization (I), organic N fertilization (O), integrated organic-inorganic N fertilization (I+O) and no fertilization (CK). The nitrifier/denitrifier abundance was determined using absolute real-time quantitative PCR. Compared with I and O, I+O significantly increased dissolved organic C content, microbial biomass C and microbial biomass N by 24–63%, 12–38% and 13–36% on average, respectively. Moreover, the seasonal cumulative N<subscript>2</subscript>O-N emissions and fertilizer-induced N<subscript>2</subscript>O emission factor under I+O were significantly lower than those under I and O by 17–29% and 23–39%, respectively. The results indicate that N fertilizer type significantly affects the N<subscript>2</subscript>O emissions, and the integrated organic-inorganic N fertilization can mitigate the N<subscript>2</subscript>O emissions primarily by inhibiting the nitrification mediated by ammonia-oxidizing bacteria in purple caitai fields. Integrated organic-inorganic N fertilization is an ideal N fertilization regime to enhance soil fertility and yield and reduce N<subscript>2</subscript>O emissions in the upland fields. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20770472
- Volume :
- 12
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Agriculture; Basel
- Publication Type :
- Academic Journal
- Accession number :
- 157128359
- Full Text :
- https://doi.org/10.3390/agriculture12050723