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<p>In this study, the maize planting area of Yinchuan Plain in northern Ningxia, China was taken as the object. The response of groundwater nitrogen ( ammonium nitrogen, nitrate nitrogen, nitrite nitrogen ) to different nitrogen application rates ( CK, F1, F2, F3 ) in farmland was explored. The results showed that nitrogen application significantly increased the nitrogen concentration in groundwater, and high nitrogen application treatment ( F3 ) showed a stronger effect in most growth stages. In 2023, the concentration of ammonium nitrogen and nitrite nitrogen in groundwater of F3 treatment reached the peak at jointing stage. In 2024, the concentration of ammonium nitrogen in F3 treatment was higher at tillering stage and decreased sharply at jointing stage. There are differences in groundwater nitrogen dynamics between 2023 and 2024. The concentrations of ammonium nitrogen and nitrate nitrogen in groundwater in 2024 are lower than those in 2023. Correlation analysis showed that ammonium nitrogen was negatively correlated with pH and nitrate nitrogen, nitrate nitrogen was positively correlated with dissolved oxygen ( DO ) and oxidation-reduction potential ( ORP ), and nitrite nitrogen was negatively correlated with nitrate nitrogen and ORP. This study reveals the dynamic influence mechanism of nitrogen application rate on groundwater nitrogen, and provides a theoretical basis for optimizing nitrogen fertilizer management and preventing and controlling groundwater nitrogen pollution.</p>

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Response of groundwater nitrogen to different nitrogen application rates in farmland

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月27日

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  • Tingqi Xiao,
  • Jiarong Guan,
  • Bo Feng,
  • Ning Feng,
  • Xin Zhang,
  • Jinbao Shui,
  • Yanxia Zhong

摘要

In this study, the maize planting area of Yinchuan Plain in northern Ningxia, China was taken as the object. The response of groundwater nitrogen ( ammonium nitrogen, nitrate nitrogen, nitrite nitrogen ) to different nitrogen application rates ( CK, F1, F2, F3 ) in farmland was explored. The results showed that nitrogen application significantly increased the nitrogen concentration in groundwater, and high nitrogen application treatment ( F3 ) showed a stronger effect in most growth stages. In 2023, the concentration of ammonium nitrogen and nitrite nitrogen in groundwater of F3 treatment reached the peak at jointing stage. In 2024, the concentration of ammonium nitrogen in F3 treatment was higher at tillering stage and decreased sharply at jointing stage. There are differences in groundwater nitrogen dynamics between 2023 and 2024. The concentrations of ammonium nitrogen and nitrate nitrogen in groundwater in 2024 are lower than those in 2023. Correlation analysis showed that ammonium nitrogen was negatively correlated with pH and nitrate nitrogen, nitrate nitrogen was positively correlated with dissolved oxygen ( DO ) and oxidation-reduction potential ( ORP ), and nitrite nitrogen was negatively correlated with nitrate nitrogen and ORP. This study reveals the dynamic influence mechanism of nitrogen application rate on groundwater nitrogen, and provides a theoretical basis for optimizing nitrogen fertilizer management and preventing and controlling groundwater nitrogen pollution.