NxO emissions in response to the irrigation lower limits under different irrigation modes in a lettuce field

Irrigation has a significant impact on NXO (N2O and NO) emissions from cultivated land, yet the N2O or NO emission among the irrigation lower limits under different irrigation modes has not been well compared. In an irrigated lettuce field, three DR (drip irrigation) lower limits were designed, incl...

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Bibliographic Details
Published in:International journal of agricultural and biological engineering 2023-07, Vol.16 (4), p.159-166
Main Authors: Hou, Maomao, Xiao, Ying, Zhu, Qinyuan, Chen, Jingnan, Huang, Huan, Jin, Qiu, Zhu, Lin, Zhong, Fenglin
Format: Article
Language:English
Subjects:
Agricultural management
Agricultural production
Cultivated lands
Drip irrigation
Emissions
Fertilizers
Field capacity
Fluxes
Furrow irrigation
Furrows
Gases
Irrigation
Lettuce
Moisture content
Nitrification
Nitrogen
Nitrous oxide
Potassium
Soils
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Summary:Irrigation has a significant impact on NXO (N2O and NO) emissions from cultivated land, yet the N2O or NO emission among the irrigation lower limits under different irrigation modes has not been well compared. In an irrigated lettuce field, three DR (drip irrigation) lower limits were designed, including 75% (DR1), 65% (DR2) and 55% (DR3) field capacity, and one FI (furrow irrigation) lower limit (65% field capacity). The N2O and NO emission fluxes and soil nitrogen (N) fonus were detennined, and the linear correlation between these indicators was analyzed. Results showed that under the same inigation regime, the N2O and NO emissions from furrow irrigation treatment increased by 36.8% and 45.2% respectively compared to that from drip inigation treatment. The cumulative N2O and NO emissions under DR3 were 30.2% and 28.6% higher than under DR1, respectively. Moreover, DR1 was also the lowest among the four treatments in soil NO)-N concentration. The N2O and NO emission fluxes were more correlated to soil NI I, -N (i=0.88 and 0.76) or NO;-N (r=0.90 and 0.80) concentration than soil NO,-N and soluble organic N, indicating that N2O and NO were mainly produced by the soil nitrification process. When the irrigation regime was the same, N2O and NO emissions were lower with drip irrigation than with furrow irrigation. Besides, drip irrigation with small quota but high frequency reduced N2O and NO emission compared to that with large quota but low frequency.
ISSN:1934-6344
1934-6352
DOI:10.25165/j.ijabe.20231604.7961