Interactive Effects of Soil Fertility and Nitrogen Application Rate on N2O Emissions from Double-Cropping Rice Paddies
Received date: 2025-04-25
Online published: 2025-09-11
Soil fertility and nitrogen application rate are important factors influencing nitrous oxide (N2O) emissions from paddy fields, but the interaction effects between these two remain unclear. In this study, three types of field plots (FL, low-fertility soil; FM, medium-fertility soil; FH, high-fertility soil) were selected based on the soil organic matter content, and four levels of nitrogen application rates were set (i.e., 0, 90, 150, and 210 kg/hm2, represented by N0, N90, N150, and N210, respectively), aiming to elucidate the interaction effects of soil fertility and nitrogen application rate on N2O emissions from double-cropping rice paddies. The results showed that improving soil fertility significantly reduced N2O emissions from double-cropping rice paddies, whereas increasing nitrogen application rate increased N2O emissions during the early rice season. For N2O emissions during the early rice season, FH and FM decreased emissions by 34.3% and 16.7%, respectively, compared to FL. Compared with N0 treatment, N150 and N210 treatments during the early rice season increased N2O emissions by 11.3% and 21.8%, respectively, while there was no significant difference between N90 and N0 treatment. For N2O emissions during the late rice season, FH and FM decreased emissions by 30.0% and 13.7%, respectively, compared to FL, while no significant differences among different nitrogen fertilizer treatments. There was a significant interaction effect between nitrogen application rate and soil fertility on N2O emissions during the early rice season. In the FL plot, compared to N0 treatment, the N210 treatment significantly increased N2O emissions by 50.7%, while the N90 and N150 treatments showed no significant difference. In the FM and FH plots, none of the nitrogen fertilizer treatments had significant effects on N2O emissions. Therefore, improving soil fertility combined with appropriate nitrogen application rate is beneficial for mitigating N2O emission in paddy fields.
Key words： double-cropping rice; nitrous oxide; soil fertility; nitrogen fertilizer
ZHU jianmin, FU Wentao, SUN Wenxia, ZHANG Yuxiang, HUANG Shan, SUN Yanni . Interactive Effects of Soil Fertility and Nitrogen Application Rate on N2O Emissions from Double-Cropping Rice Paddies[J]. China Rice, 2025 , 31(5) : 71 -75 . DOI: 10.3969/j.issn.1006-8082.2025.05.011
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