Exploring the effects of different water and fertilizer irrigation systems on N2O and CO2 emissions is of great significance for promoting sustainable agricultural development. In this study, summer maize in Henan Province was selected as the research object, and field experiments were carried out from 2023 to 2024. A total of 12 water and fertilizer treatments were set up. In situ field measurements of N2O and CO2 in farmland were carried out using static chamber gas chromatography to study the effects of different water and fertilizer irrigation systems on N2O and CO2 emissions from farmland and the simulation performance of the DNDC model. The results were as follows: (1) Irrigation and fertilization significantly interacted to affect N2O and CO2 emissions. (2) The summer maize yield under the B2 treatment was the highest, and the total N2O and CO2 emissions under the C3 treatment were the highest. (3) Under the DNDC simulation scenario, the summer maize yields under the real-time irrigation system in 2023 and 2024 increased by 4.43% and 4.38% compared with those under full irrigation. The total N2O emissions from farmland were reduced by 6.56% and 6.22%, while CO2 emissions decreased by 14.49% and 14.79%, respectively. The results show that real-time water and fertilizer irrigation systems can promote the yield of summer maize and reduce greenhouse gas emissions. The research results provide a theoretical basis for reducing greenhouse gas emissions from farmland and are significant for promoting sustainable agricultural development.
Cui et al. (Wed,) studied this question.
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