BACKGROUND: Impact of incorporating hairy vetch into soil on mitigating nitrous oxide (N2O) emissions from maize field in South Korea has not been investigated but only on soil properties and nutrients for crops. Therefore, this study was conducted to examine N2O emission from upland soil incorporated with hairy vetch for a year in maize field.
METHODS AND RESULTS: Hairy vetch was grown in an upland soil from November, 2017 to May, 2018 and incorporated into soil on May 25 of 2018. Control and conventional treatment (NPK) were included for comparison. Gas samples were collected weekly for a year to examine N2O emissions from the soil. Chemical nitrogen (N) fertilizer stimulated N2O emission in short term resulting in the greatest cumulative N2O emission in NPK (6.72 kg N2O ha-1) compared to the control (4.04 kg N2O ha-1) and hairy vetch (5.43 kg N2O ha-1), and the greatest yield of maize from NPK, because total N input was much greater in NPK (186 N kg ha-1) than in hairy vetch (81.6 N kg ha-1).
CONCLUSION: Incorporation of hairy vetch reduced N2O emissions from the maize cultivated compared to NPK treatment. However, further research on improving crop productivity with incorporation of hairy vetch is needed.