4.6 Article

Optimization of Nitrogen Fertilizer Application with Climate-Smart Agriculture in the North China Plain

期刊

WATER
卷 13, 期 23, 页码 -

出版社

MDPI
DOI: 10.3390/w13233415

关键词

Fluvisols; global warming potential; maize yield; NO3--N; nitrogen use efficiency; N2O

资金

  1. China Agriculture Research System [CARS-02]
  2. National Natural Science Foundation of China [51879267]
  3. Basic Scientific Research Project of Chinese Academy of Agricultural Sciences [FIRI202004-02, FIRI 2019-05-03]
  4. Agricultural Science and Technology Innovation Program (ASTIP), Chinese Academy of Agricultural Sciences

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This study conducted field experiments to investigate the effects of nitrogen application on N2O emissions, residual nitrogen concentration, maize yield, and nitrogen utilization efficiency. The results showed that excessive nitrogen application led to increased nitrate nitrogen residuals, N2O emissions, and decreased nitrogen efficiency and maize productivity. Optimal nitrogen application can increase maize yield, reduce N2O emissions, and improve nitrogen use efficiency.
Long-term excessive nitrogen fertilizer input has resulted in several environmental problems, including an increase in N2O emissions and the aggravation of nitrate leaching; monitoring nitrogen fertilizer is crucial for maize with high yield. This study aimed to optimize the amount of nitrogen applied to maize by Climate-Smart Agriculture (CSA) so as to continuously improve agricultural productivity and reduce or eliminate N2O emissions as much as possible. Field experiments with a completely randomized design were conducted to examine the effects of six nitrogen treatments (N application levels of 0, 120, 180, 240, 300, 360 kg & BULL;ha(-1), respectively) on N2O emissions, residual concentration of nitrate and ammonium nitrogen, maize yield, and nitrogen utilization efficiency in 2018 and 2019. The results indicated that the residual concentration of nitrate nitrogen (NO3--N) in the two seasons significantly increased; N2O emissions significantly increased, and the nitrogen fertilizer agronomic efficiency and partial productivity of maize fell dramatically as the nitrogen application rate increased. The maize grain yield rose when the N application amount was raised (N application amount < 300 kg & BULL;ha(-1)) but decreased when the N application amount > 300 kg & BULL;ha(-1). An increase in the nitrogen application rate can decrease nitrogen use efficiency, increase soil NO3--N residual, and N2O emissions. Reasonable nitrogen application can increase maize yield and reduce N2O emissions and be conducive to improving nitrogen use efficiency. By considering summer maize yield, nitrogen use efficiency, and farmland ecological environment, 173.94~178.34 kg N kg & BULL;ha(-1) could be utilized as the nitrogen threshold for summer maize in the North China Plain.

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