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| Greenhouse tomato yield and N2O emissions based on irrigation model |
| Received:March 16, 2023 |
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| KeyWord:N2O emission;water-fertilizer-air coupling;greenhouse tomato;soil;irrigation water;fertilizer application |
| Author Name | Affiliation | E-mail | | DUAN Linbo | College of Water Resources and Civil Engineering, Northwest A&F University, Yangling 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid Regions of Ministry of Education, Northwest A&F University, Yangling 712100, China | | | CAI Huanjie | College of Water Resources and Civil Engineering, Northwest A&F University, Yangling 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid Regions of Ministry of Education, Northwest A&F University, Yangling 712100, China | huanjie@tom.com | | SUN Yanan | College of Water Resources and Civil Engineering, Northwest A&F University, Yangling 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid Regions of Ministry of Education, Northwest A&F University, Yangling 712100, China | | | MA Jing | College of Water Resources and Civil Engineering, Northwest A&F University, Yangling 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid Regions of Ministry of Education, Northwest A&F University, Yangling 712100, China | | | YANG Nan | College of Water Resources and Civil Engineering, Northwest A&F University, Yangling 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid Regions of Ministry of Education, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| The objectives of this study were to investigate the changing patterns of N2O emissions from facility vegetable fields, understand the impact of water-fertilizer-gas coupling on soil N2O emissions, comprehensively evaluate different water-fertilizer-gas treatments, and propose effective measures for emission reduction. The experiment focused on tomatoes as the test crop, considering three factors：irrigation （I）, fertilizer（F）, and aeration（A）levels. Two fertilizer levels under full irrigation without aerated（CK）irrigation were set as the control. The study included two irrigation levels[I1 and I2：deficit irrigation and full irrigation, corresponding to crop-pan coefficients（Kcp）of 0.8 and 1.0, respectively], two fertilization levels（F1 and F2：low and high fertilization, corresponding to N application rates of 180 kg·hm-2 and 240 kg·hm-2, respectively）, and two aeration levels（A1 and A2：1 and 2 times gas, respectively）, resulting in a total of 10 treatments. N2O emissions from greenhouse tomato soils were monitored and analyzed throughout the tomato reproductive period using a static dark box-gas chromatography method. The aim was to investigate the effects of water-fertilizer-gas coupling on N2O emissions and analyze the influencing factors. The results indicated that increasing both irrigation water and fertilizer application led to an increase in soil N2O emission flux. The average N2O emission flux of the I2 treatment showed a 14.79% increase（P>0.05）compared to the I1 treatment, while the F2 treatment exhibited a 34.90% increase（P<0.05）compared to the F1 treatment. Aerated irrigation significantly affected soil N2O emission flux, with the A1 and A2 treatments showing a 10.02%（P>0.05）and 62.92%（P<0.05）increase, respectively, compared to the CK treatment. Overall, the soil N2O emission flux exhibited an exponential positive correlation with soil water-filled porosity, a positive exponential correlation when soil temperature was less than or equal to 26 ℃, a linear negative correlation when soil temperature exceeded 26 ℃, and an exponential positive correlation with NO3--N content. Based on considering tomato yield, cumulative N2O emissions, irrigation water use efficiency, nitrogen partial factor productivity, and cumulative N2O emissions per yield, the recommended irrigation mode for greenhouse tomatoes to optimize yield, water conservation, and emission reduction is 1-fold gas-sufficient irrigation（Kcp=1.0）with a fertilizer application rate of 180 kg·hm-2. |
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